Send a confirmation email when the order is canceled or refunded

[IKarbowiak]

Send a confirmation email when the order is canceled or refunded.

Impact

• New migrations
• New/Updated API fields or mutations
• Deprecated API fields or mutations
• Removed API types, fields, or mutations
• Documentation needs to be updated

Pull Request Checklist

• Privileged queries and mutations are guarded by proper permission checks
• Database queries are optimized and the number of queries is constant
• Database migration files are up to date
• The changes are tested
• GraphQL schema and type definitions are up to date
• Changes are mentioned in the changelog

[codecov]

Codecov Report

Merging #6017 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6017   +/-   ##
=======================================
  Coverage   91.57%   91.58%           
=======================================
  Files         387      387           
  Lines       25237    25260   +23     
  Branches     2367     2367           
=======================================
+ Hits        23112    23135   +23     
  Misses       1547     1547           
  Partials      578      578           

Impacted Files	Coverage Δ
saleor/order/__init__.py	100.00% <100.00%> (ø)
saleor/order/actions.py	94.83% <100.00%> (+0.06%)	⬆️
saleor/order/emails.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fa27fad...4c7bbd6. Read the comment docs.

[db-queries]

Here is the report for 4c7bbd6 (mirumee/saleor @ add-emails-for-refund-and-cancel-order)
Base comparison is fa27fad.

No differences were found. (click me)

# saleor.graphql.accountbenchmark account
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  delete staff members                                       	         32	         32	              0
  query staff user                                           	         20	         20	              4
  staff create                                               	         22	         22	              4
  staff update groups and permissions                        	         33	         33	              5

# saleor.graphql.accountbenchmark permission group
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  permission group create                                    	         19	         19	              2
  permission group delete                                    	         20	         20	              3
  permission group query                                     	          7	          7	              0
  permission group update                                    	         33	         33	              1
  permission group update remove users with manage staff     	         27	         27	              3

# saleor.graphql.checkoutbenchmark checkout mutations
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  add billing address to checkout                            	         50	         50	             26
  add shipping to checkout                                   	         37	         37	             11
  checkout email update                                      	         28	         28	             13
  checkout payment charge                                    	         30	         30	              8
  checkout shipping address update                           	         39	         39	             11
  checkout voucher code                                      	         57	         57	             31
  complete checkout                                          	         91	         91	             26
  create checkout                                            	        125	        125	             60
  update checkout lines                                      	         92	         92	             40

# saleor.graphql.checkoutbenchmark homepage
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  user checkout details                                      	         50	         50	             27

# saleor.graphql.menubenchmark homepage
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  retrieve main menu                                         	          5	          5	              0
  retrieve secondary menu                                    	          5	          5	              0

# saleor.graphql.orderbenchmark order
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  user order details                                         	         17	         17	              3

# saleor.graphql.productbenchmark category
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  category view                                              	         18	         18	              1

# saleor.graphql.productbenchmark collection
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  collection view                                            	         17	         17	              0

# saleor.graphql.productbenchmark homepage
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  featured products list                                     	         14	         14	              0
  retrieve product list                                      	          5	          5	              0

# saleor.graphql.productbenchmark product
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  product details                                            	         16	         16	              0
  retrieve product attributes                                	          7	          7	              0

# saleor.graphql.productbenchmark variant
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  product variant bulk create                                	         47	         47	              2
  retrieve variant list                                      	         18	         18	              2

# saleor.graphql.productbenchmark variant stocks
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  product variants stocks create                             	         22	         22	              5
  product variants stocks delete                             	         19	         19	              5
  product variants stocks update                             	         27	         27	              5

# saleor.graphql.producttest product sorting attributes
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  sort product not having attribute data                     	         20	         20	              0

# saleor.graphql.shopbenchmark homepage
  test name                                                  	left count 	right count	duplicate count
  -----------------------------------------------------------	-----------	-----------	---------------
  retrieve shop                                              	          2	          2	              0