Update Layout Builder panel size

Right now, only the following Block Admin options are available to be easily overridden without preprocessing multiple $links arrays:

• Block Configure (patch applies 900px width)
• Block Move/Remove (patch applies 400px width)

I'm adding this to the Beta 7 release plan to include the patch attached above.

For now I'm actually removing this from the Beta 7 release out of concern for an inconsistent user experience that may be confusing. As it works now, the edit form for blocks is greatly improved since the off-canvas tray is made wider by default, but the flow for adding a new block still uses the narrow tray for the form. I worry the inconsistency of this experience will be confusing to editors.

When used with the patch from ✨ Modify Layout Builder's use of the off-canvas tray to improve UX of larger block forms Needs work , the experience is more consistent since the add form becomes wider as well.

Until that issue is resolved and merged in, we may need to explore an alternative solution where the remaining links could be altered and the experience would be more uniformly improved.