feat: add onFocusEnter, onFocusLeave, onEscape callback props

[mxschll]

Description

• This PR refactors adds onFocusEnter, onFocusLeave, onEscape event handlers to the Dropdown component
• Renames onDropdownClose to onOutsideClick

See proposal RGJgABPXohP8 for more context.

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.35%. Comparing base (87a3e47) to head (c9c9752).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4259   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files         888      889    +1     
  Lines       26031    26058   +27     
  Branches     9411     9422   +11     
=======================================
+ Hits        25343    25370   +27     
  Misses        641      641           
  Partials       47       47           

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