feat: adding bulk user validation endpoint for admin console

[jacobo-dominguez-wgu]

Description

Implements a new api/authz/v1/users/validate/ endpoint for bulk user validation to support admin console operations during role assignments.
Accepts a JSON payload with a users array containing usernames and/or email addresses, validates the list of input data using serializer and checks for required field, proper format, deduplication, and finally processes each identifier individually to check existence.
Required permissions: manage_library_team OR manage_course_team in any scope.
Superuser/staff bypass.

It resolves #232

Deadline: Verawood.

Testing instructions

Make sure to have a local tutor dev installation.
Only users with team manage permissions are allowed to use this endpoint.

POST http://local.openedx.io:8000/api/authz/v1/users/validate/

{
  "users": [
    "user.invalide@example.com", "duplicated_user", "duplicated_user", "any_valid_user"
  ]
}

Expected response:

{
  "valid_users": [
    "any_valid_user",
  ],
  "invalid_users": [
    "user.invalide@example.com",
    "duplicated_user",
  ],
  "summary": {
    "total": 3,
    "valid_count": 1,
    "invalid_count": 2
  }
}

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

[openedx-webhooks]

Thanks for the pull request, @jacobo-dominguez-wgu!

This repository is currently maintained by @openedx/committers-openedx-authz.

Once you've gone through the following steps feel free to tag them in a comment and let them know that your changes are ready for engineering review.

🔘 Get product approval

If you haven't already, check this list to see if your contribution needs to go through the product review process.

• If it does, you'll need to submit a product proposal for your contribution, and have it reviewed by the Product Working Group.
  • This process (including the steps you'll need to take) is documented here.
• If it doesn't, simply proceed with the next step.

🔘 Provide context

To help your reviewers and other members of the community understand the purpose and larger context of your changes, feel free to add as much of the following information to the PR description as you can:

• Dependencies

  This PR must be merged before / after / at the same time as ...

• Blockers

  This PR is waiting for OEP-1234 to be accepted.

• Timeline information

  This PR must be merged by XX date because ...

• Partner information

  This is for a course on edx.org.

• Supporting documentation
• Relevant Open edX discussion forum threads

🔘 Get a green build

If one or more checks are failing, continue working on your changes until this is no longer the case and your build turns green.

Details

---

Where can I find more information?

If you'd like to get more details on all aspects of the review process for open source pull requests (OSPRs), check out the following resources:

• Overview of Review Process for Community Contributions
• Pull Request Status Guide
• Making changes to your pull request

When can I expect my changes to be merged?

Our goal is to get community contributions seen and reviewed as efficiently as possible.

However, the amount of time that it takes to review and merge a PR can vary significantly based on factors such as:

• The size and impact of the changes that it introduces
• The need for product review
• Maintenance status of the parent repository

💡 As a result it may take up to several weeks or months to complete a review and merge your PR.

[Copilot]

Pull request overview

Adds a new bulk user validation endpoint to support admin console role-assignment flows by validating a list of usernames/emails and returning valid/invalid identifiers plus summary counts.

Changes:

• Introduces POST /api/authz/v1/users/validate/ with Any-scope manage-permissions enforcement and structured response.
• Adds request/response serializers (including a summary sub-serializer) and routes the endpoint in v1 URLs.
• Adds a comprehensive REST API test suite for the new endpoint and bumps version/changelog.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
openedx_authz/rest_api/v1/views.py	Adds UserValidationAPIView endpoint implementation, permissions, and API doc schema.
openedx_authz/rest_api/v1/urls.py	Registers the new users/validate/ route.
openedx_authz/rest_api/v1/serializers.py	Adds request/response serializers for bulk validation.
openedx_authz/rest_api/v1/fields.py	Adds a serializer for response summary statistics.
openedx_authz/tests/rest_api/test_views.py	Adds test coverage for request validation, permissions, deduplication, and responses.
openedx_authz/init.py	Bumps package version to 1.6.0.
CHANGELOG.rst	Adds 1.6.0 release notes entry for the new endpoint.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[rodmgwgu]

Functionality looks good, just one nit change.

Also, please run make format before pushing changes, so we get uniform code style.

Thanks!

[rodmgwgu]

If we are already logging this in the controller, I think we can remove this from here and the logger instance.

[rodmgwgu]

Looks good, thanks!

[mariajgrimaldi]

LGTM!

[mariajgrimaldi]

@jacobo-dominguez-wgu: can we rebase so we can merge? Thanks!