remove unused around_the_library.html and get_random_recent_changes

[siddarth2810]

Closes #9896

refactor and cleanup

Technical

• deleted the unused file around_the_library.html and the function get_random_recent_changes which is present in the openlibrary/plugins/upstream/utils.py
• Verified that around_the_library.html and get_random_recent_changes were not referenced or called anywhere else in the codebase

Testing

1. Verify that the file openlibrary/templates/site/around_the_library.html has been deleted
2. Check openlibrary/plugins/upstream/utils.py to confirm that the function get_random_recent_changes has been removed
3. Run the application and ensure no errors occur related to these deletions

Stakeholders

@scottbarnes

[siddarth2810]

Hi, my major concern was recentchanges_v2 feature flag, but after going through the code i think that deleting these files wont affect its functionality and I confirmed that /recentchanges page which is linked to this, is also working fine. So went ahead with the PR

Please let know if this is alright. Thanks !

[scottbarnes]

Looks great. Thanks for this, @siddarth2810. It always feels good to delete old code. :)

Thanks also for the detailed steps you took while testing. That helps a lot.