fix: add hover transparency and rounded top to ApiKeyListItem actions

[KartikLabhshetwar]

What does this PR do?

• Fixes fix(api-keys): Remove bg-subtle hover background from delete dropdown item #26149
• Fixes CAL-6970

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Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Removes the subtle hover background and fixes the top border radius on the Delete action in ApiKeyListItem to match the menu styling. Aligns the delete dropdown UI with the design spec (CAL-6970).

^{Written for commit edec3e4. Summary will update automatically on new commits.}

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