Prevent unrelated buttons from being processed when the modal is opened

Problem/Motivation

If you have a custom block that renders with a button, there can be AJAX issues thrown when trying to open the media library inside Layout Builder.

Steps to reproduce

• Create a custom block that has a media library field in it's configuration form
• Make sure the block renders a button element
• Add the block to a Layout Builder page
• Try to open the media library in the block configuration
• Observe AJAX issues when the button from step 2 is processed

Proposed resolution

Set drupalAutoButtons to FALSE in the dialog options

Remaining tasks

Tests
Merge if happy with the result

User interface changes

N/A

API changes

N/A

Data model changes

N/A