VACMS-11011: Disable vagovadmin theme

[edmund-dunn]

Description

Relates to #11011

Testing done

Tested locally, checked /admin/structure/block for any missing, broken or duplicate blocks.

Screenshots

QA steps

What needs to be checked to prove this works?
What needs to be checked to prove it didn't break any related things?
What variations of circumstances (users, actions, values) need to be checked?

1. Navigate to /admin/structure/block
   • Validate that there are no missing, borken or duplicate blocks.
2. Then navigate to /admin/appearance
   • Validate that vagovadmin is not installed. (Note: Seven should still be installed. )

Definition of Done

• Documentation has been updated, if applicable.
• Tests have been added if necessary.
• Automated tests have passed.
• Code Quality Tests have passed.
• Acceptance Criteria in related issue are met.
• Manual Code Review Approved.

Select Team for PR review

• CMS Team
• Public websites
• Facilities
• User support

Is this PR blocked by another PR?

• DO NOT MERGE

Does this PR need review from a Product Owner

• Needs PO review

CMS user-facing annoucement

Is an announcement needed to let editors know of this change?

• Yes, and it's written in issue ____ and queued for publication.
  • Merge and ping the UX writer so they are ready to publish after deployment
• Yes, but it hasn't yet been written
  • Don't merge yet -- ping the UX writer to write and queue content
• No announcement is needed for this code change.
  • Merge & carry on unburdened by announcements

[ndouglas]

Looks good. I clicked around a couple dozen random pages and didn't see any issues (e.g. missing or multiple blocks, broken layouts, etc). Tests pass. Good work!