refactor: remove libraries routes and libraries-manager module

[jacobo-dominguez-wgu]

Description

Removed the libraries manager module and all of its codebase under the paths /libraries/:libraryId and /libraries/:libraryId/:username.

• Delete entire src/authz-module/libraries-manager/ directory
• Remove LIBRARIES_USER_PATH and LIBRARIES_TEAM_PATH from ROUTES
• Move ErrorPage component to src/authz-module/components/ErrorPage/ (still used as the module-level error boundary fallback)
• Update index.tsx imports and remove library route definitions
• Remove library-related test cases from index.test.tsx

Closes #136

[openedx-webhooks]

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

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

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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.64%. Comparing base (bceb3c0) to head (8baf934).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
+ Coverage   97.46%   97.64%   +0.17%     
==========================================
  Files          89       68      -21     
  Lines        2133     1572     -561     
  Branches      461      394      -67     
==========================================
- Hits         2079     1535     -544     
+ Misses         52       37      -15     
+ Partials        2        0       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[rodmgwgu]

Tested in local, all good, thanks!

[jesusbalderramawgu]

This is a great cleanup, thank you!