Filtering: use search in a consistent way

[fowczarek]

I want to merge this change because:

• resolve Filtering: use search in a consistent way #4007
• resolve Extend the ProductOrderField #4711

Screenshots

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.

[django-queries]

Here is the report for 445d590 (mirumee/saleor @ 4007/use_search_in_consistent_way)
Base comparison is e27a609.

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                     	         13	         13	              3

# api.benchmark variant
  test name                           	left count 	right count	duplicate count
  ------------------------------------	-----------	-----------	---------------
  retrieve variant list               	         15	         15	              8

[codecov]

Codecov Report

Merging #4715 into master will increase coverage by 0.04%.
The diff coverage is 99%.

@@            Coverage Diff             @@
##           master    #4715      +/-   ##
==========================================
+ Coverage   91.67%   91.72%   +0.04%     
==========================================
  Files         310      313       +3     
  Lines       18659    18744      +85     
  Branches     1847     1849       +2     
==========================================
+ Hits        17106    17192      +86     
+ Misses       1041     1040       -1     
  Partials      512      512

Impacted Files	Coverage Δ
saleor/graphql/menu/filters.py	100% <100%> (ø)
saleor/graphql/menu/schema.py	100% <100%> (+3.03%)	⬆️
saleor/graphql/order/filters.py	83.63% <100%> (+2%)	⬆️
saleor/graphql/extensions/filters.py	100% <100%> (ø)
saleor/graphql/utils.py	91.11% <100%> (+0.09%)	⬆️
saleor/extensions/manager.py	88.13% <100%> (ø)	⬆️
saleor/graphql/page/schema.py	100% <100%> (ø)	⬆️
saleor/graphql/extensions/schema.py	100% <100%> (ø)	⬆️
saleor/graphql/product/schema.py	100% <100%> (ø)	⬆️
saleor/graphql/product/filters.py	92.68% <100%> (+0.37%)	⬆️
... and 6 more

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