[GraphQL] Add possibility to filter categories by parent_id

[rogyar]

Description (*)

This PR introduces a possibility to filter the result set of categories by parent_id

Fixed Issues (if relevant)

1. [GraphQL] Add parent_id to filters for subcategory pagination #30624 : Add parent_id to filters for subcategory pagination

Manual testing scenarios (*)

1. Create a set of categories and subcategories for your Magento installation
2. Use the following queries to filter categories by parent_id (change the ID's to the actual values for your setup)

{
  categories(filters: {parent_id: {eq: "2"}}) {
    items {
      name
    }
  }
}

{
  categories(filters: {parent_id: {in: ["2", "3"]}}) {
    items {
      name
    }
  }
}

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[rogyar]

@magento run WebAPI Tests

[keharper]

@rogyar Will you/Atwix be updating the documentation, or should I do it?

[magento-engcom-team]

Hi @sivaschenko, thank you for the review.
ENGCOM-8373 has been created to process this Pull Request
✳️ @sivaschenko, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[rogyar]

@andrewbess would you cover the documentation, please?

[andrewbess]

@rogyar
Thank you. I will do it ASAP

[cpartica]

We also have to update architectural repo. I'l do it. @rogyar .. so parent id just works? no other code needed?

[cpartica]

@magento run all tests

[rogyar]

Hi @cpartica. Yep, parent_id works since it's in the collection. I've covered this part with a test.

[m2-assistant]

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