Fix Multi URL Picker in Block List Editor

[madsrasmussen]

fixes #11100

Properties from tabs were rendered twice. One for direct properties for a tab and one for groups because they are part of the groups' array. This PR prevents a group to be rendered in the groups' array if it is a "tab".

Multi URL Picker listens for a form submit event and sets the value based on a render value. Because the property is rendered twice, when it is a direct property on a tab, it resets its own value.

The reset only happens in the Block List editor because of how it syncs its values. I have added the fix to the content, media, and members section for performance reasons. We don't want more properties in the DOM than needed.

How to test:

• See the issue for testing instructions for the bug.
• Please also do some "general" testing of tabs and groups in content, media and member sections and this changes how we render them.

[Zeegaan]

Tested this and it works great! 👍

Code looks good to my untrained frontend eyes 👓