Resolve "Extremely low contrast in dropdown for group file templates"

What does this MR do?

Fixes some of the text from changing to white on the hover state.

Before	After
$white-light	$gray-800

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Closes #28311 (closed)

/cc @mvanremmerden