Reduce ActionMenu test flakes

[camertron]

Some of our ActionMenu tests are flaky and it's been irritating me for months now, so I finally decided to fix it.

Integration

No changes necessary in production - this is a test-only change.

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

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Latest commit: e694688

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