Summary

Fixes #4679. Changes to ownFocus in EuiPopover affected the underlying focus trap on outside clicks. Clicking a color stop thumb while the popover was open would disable the underlying focus trap, causing the focus trap to no longer watch for outside clicks. We don't want the EuiColorStopThumb popover trap to be disabled on outside click; instead, we the trap should remain active while the popover is open.

I decided to expand the prop options beyond what we currently need. Can be expanded further in the future if necessary.

Checklist

- [ ] Check against all themes for compatibility in both light and dark modes
- [ ] Checked in mobile

• Checked in Chrome, Safari, Edge, and Firefox
• Props have proper autodocs and playground toggles

- [ ] Added documentation

• Checked Code Sandbox works for the any docs examples
• Added or updated jest tests
• Checked for breaking changes and labeled appropriately
• Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately