Add music assistant to the builtin repositories

[pvizeli]

Proposed change

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Ruff (ruff format supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints of add-on configuration are added/changed:

• Documentation added/updated for developers.home-assistant.io

Summary by CodeRabbit

• New Features

  • Added support for the "Music Assistant" repository to the list of available repositories.

• Tests

  • Updated test cases to accommodate the new "Music Assistant" repository URL.
  • Added new assertions to ensure the validation of the "Music Assistant" repository.

[frenck]

Looks good, thanks, @pvizeli & @agners 👍

../Frenck