SelectPanel: Add test for event propagation

[TylerJDev]

Closes https://github.com/github/primer/issues/5901

Adds test for SelectPanel to ensure events don't propagate outside of the component, specifically certain key events.

Changelog

New

• Adds test to SelectPanel.test.tsx

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

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Latest commit: faad4d8

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[Copilot]

Pull Request Overview

This PR adds a test case to verify that keyboard events within the SelectPanel component don't propagate to parent elements, which is important for preventing unintended interactions when users are navigating through the component's options.

• Adds event propagation test for SelectPanel component
• Ensures keyboard events (specifically alphabet keys) are properly contained within the component
• Tests that events don't bubble up to parent containers when navigating through SelectPanel options