[FC-0099] feat: add default policy and fix tests

[MaferMazu]

Description

This PR adds the default authz.policy and a flag in the load_policies to remove the previous ones.

Documentation: https://openedx-authz.readthedocs.io/en/latest/concepts/core_roles_and_permissions/content_library_roles.html

Related wiki page: https://openedx.atlassian.net/wiki/spaces/OEPM/pages/4840095745/Library+Roles+and+Permissions

How to test

The easiest way is with the rest api. I added these commits over the #84 in here: https://github.com/eduNEXT/openedx-authz/tree/mfmz/test-authz, so you can:

• Use https://github.com/eduNEXT/openedx-authz/tree/mfmz/test-authz
• Run in the LMS container the python manage.py lms load_policies --clear-existing
• Enter in http://local.openedx.io:8000/api-docs/#/authz and try some endpoints (e.g., http://local.openedx.io:8000/api/authz/v1/roles/?scope=lib%3AOpenedX%3ACSPROB, and you should see the correct list of permissions for the role).

Checklist

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings) - [FC-0099] docs: add the default roles and permissions documentation #94
• Fixup commits are squashed away (I'll squash and merge)
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

[openedx-webhooks]

Thanks for the pull request, @MaferMazu!

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.

[BryanttV]

Thanks @MaferMazu! Please rebase this branch with main.

[MaferMazu]

@mariajgrimaldi @bmtcril @BryanttV, this is ready for re-review. Thanks for your patience.

[bmtcril]

I haven't compared the authz.policy changes against the docs, but otherwise LGTM

[BryanttV]

I checked the permissions for each role and tested the command. Everything works correctly. Thank you, @MaferMazu!

[MaferMazu]

Note for me: Add to the changelog #105 and #107

Done ✅

[mariajgrimaldi]

Didn't go into too much detail about the policy, but the rest looks good to go. Thank you!