Fix Gutenberg deprecation warnings

[dkotter]

Description of the Change

As of the last release our minimum supported version of WordPress is 6.6. There were quite a few deprecation warnings added in that version that we've previously been ignoring but we can now safely update those to the proper components to fix those.

In addition, while fixing those up and testing to ensure everything worked, found a few other things I thought worth fixing:

• In both our title generation and excerpt generation Features, we grab the content and/or title of the item to send along. But we grab this on page load so if someone were to update the content and then click the button, the most recent version of the content isn't used. This has been fixed
• Took some learnings from Add new Content Generation Feature #859 to make the modal we show when generating titles a bit nicer. It's now wider and if generating multiple titles, those end up in columns instead of stacked

Before

After

How to test the Change

Minimal changes made across multiple Features so ideal is to test to ensure those Features still work and no WordPress 6.5 or 6.6 deprecation warnings are shown. Note there are some deprecation notices introduced in 6.7 around bottom margin styles being deprecated since version 6.7 and will be removed in version 7.0 but decided not to address those yet

Changelog Entry

Changed - Update the layout of the generate titles modal
Fixed - Fix various Gutenberg deprecation notices added in WordPress 6.5 and 6.6
Fixed - Ensure we pass the most recent version of the content in our title and excerpt generation Features

Credits

Props @dkotter

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.