Deprecate localized field in Money type

[IKarbowiak]

Set 'localized' field in the Money type as deprecated - it's useless. Price formatting according to the current locale will be handled by the frontend client.

Closes #4934

Pull Request Checklist

1. Privileged views and APIs are guarded by proper permission checks.
2. All visible strings are translated with proper context.
3. All data-formatting is locale-aware (dates, numbers, and so on).
4. Database queries are optimized and the number of queries is constant.
5. Database migration files are up to date.
6. The changes are tested.
7. GraphQL schema and type definitions are up to date.
8. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #4952 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4952   +/-   ##
=======================================
  Coverage   91.42%   91.42%           
=======================================
  Files         351      351           
  Lines       21197    21197           
  Branches     2035     2035           
=======================================
  Hits        19380    19380           
  Misses       1260     1260           
  Partials      557      557

Impacted Files	Coverage Δ
saleor/graphql/core/types/money.py	100% <ø> (ø)	⬆️

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[django-queries]

Here is the report for 025efc5 (mirumee/saleor @ deprecate-localized-field-in-money)
Base comparison is af9de7c.

No differences were found. (click me)

# api.benchmark checkout
  test name                                  	left count 	right count	duplicate count
  -------------------------------------------	-----------	-----------	---------------
  add billing address to checkout            	         34	         34	             20
  add shipping to checkout                   	          7	          7	              0
  checkout payment charge                    	         14	         14	              0
  complete checkout                          	          6	          6	              0
  create checkout                            	         48	         48	             24

# api.benchmark homepage
  test name                                  	left count 	right count	duplicate count
  -------------------------------------------	-----------	-----------	---------------
  retrieve main menu                         	          5	          5	              0
  retrieve product list                      	          4	          4	              0
  retrieve secondary menu                    	          5	          5	              0
  retrieve shop                              	          2	          2	              0

# api.benchmark product
  test name                                  	left count 	right count	duplicate count
  -------------------------------------------	-----------	-----------	---------------
  product details                            	         15	         15	              3
  retrieve product attributes                	         13	         13	              2

# api.benchmark variant
  test name                                  	left count 	right count	duplicate count
  -------------------------------------------	-----------	-----------	---------------
  product variant bulk create                	         51	         51	              3
  retrieve variant list                      	         15	         15	              6

# api product sorting attributes
  test name                                  	left count 	right count	duplicate count
  -------------------------------------------	-----------	-----------	---------------
  sort product not having attribute data     	         21	         21	              0