Remove leanback

[MGaetan89]

Pull request

Description

This PR removes leanback related code from this project. As shown here, Google now recommends using Compose for TV instead, and no stable versions have been released in a while.

Changes made

• Self-explanatory.

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

Code Coverage

Overall Project	48.78%	🟢

There is no coverage information present for the Files changed