fix: published filter on get_feed by id

[davidgamez]

Summary:

This pull request introduces a change to the GTFS feed retrieval logic to respect user email restrictions when querying for feeds. Now, the query will only return published feeds if the user has restricted email access.

Access control improvements:

• Updated the _get_gtfs_feed method in feeds_api_impl.py to determine if only published feeds should be returned based on the result of is_user_email_restricted(), and passed this information to the get_gtfs_feeds_query function.

Expected behavior:

Internal users can get the non-published feeds

Testing tips:

Test in dev using https://mobility-feeds-dev--pr-1393-ncii6pry.web.app/feeds/mdb-742

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
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