Do not dispatch changes on block attribute hover on and off

[zaguiini]

Description

TBD

How has this been tested?

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[zaguiini]

This is necessary for #23041 to work properly. However, the solution on #23041 is not the best possible since it makes the changes object dirty without any actual changes.

A possible solution would be to introduce a new piece of state that would have the visualizer itself, and not pollute the changes object, thus not triggering a false alarm.