WIP: FIX #8897: "Use default" mechanism for Admin GUI and APIs

[lbajsarowicz]

Description (*)

1. Address the issue
2. Cover with tests (Integration and API Functional)
3. Fix the issue

Related Pull Requests

Fixed Issues (if relevant)

1. Saving product with non-default store scope causes untouched attributes to become store scoped if loaded using ProductRepository #8897
2. REST API : Save Product Detail per store view not working  #4952
3. REST API catalogProductRepositoryV1 overwriting default values #9186
4. Updating a product through the API unchecks "Use Default Value" on a bunch of attributes #26484
5. REST API Category translation #17186

Manual testing scenarios (*)

TBD

Questions or comments

Side effects:

1. Reduced EAV tables size, due to the removal of duplicated data.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

Support

Solving this issue is supported by Mediotype

[m2-assistant]

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[hostep]

Thanks for working on this @lbajsarowicz!

Is this going to fix #9186 & #26484 as well? (those are duplicates btw, there are probably a lot more tickets in github mentioning the same issue)
Also: #17186 (for categories)

[lbajsarowicz]

@hostep Yes, my changes are going to fix most of these.

[lbajsarowicz]

@magento run all tests

I have no idea why it hasn't started o.O

[lbajsarowicz]

I've extracted url_key / url_path part from this PR to separate one #27291

[lbajsarowicz]

I'm really sorry to disappoint you, as - due to limited time - I was unable to fix that before 2.4 feature freeze. I'm going to fix that before 2.5

[m2-assistant]

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