Keyboard accessibility for automation-action-row (convert M2->M3)

[karwosts]

Proposed change

Fix some accessibility issues in the automation editor. Starting with the action row only for proof of concept. (save triggers/conditions for later)

This PR fixes:

1. The overflow menu seems it cannot currently even be opened with the keyboard. Focusing the button menu and pressing any keystroke just expands/collapses the expansion panel.
2. If you could get it open, you still couldn't navigate past the disabled items (see Can't get past disabled overflow menu items with keyboard #20002). This is fixed by converting to ha-md-button-menu, which does not have this bug.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io