Send API requests only on the required pages

[burhandodhy]

Description of the Change

This PR fixes the issue where the plugin sends unwanted API calls on all the admin pages.

Closes #

How to test the Change

Changelog Entry

Fixed - Limit API calls on unwanted admin pages.

Credits

Props @burhandodhy

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [x] All new and existing tests pass.

[jonnynews]

Is this a fix for https://github.com/10up/brightcove-video-connect/issues/367?