feat: add onFocusIn and onFocusOut callback props

[mxschll]

Description

• This PR refactors adds onFocusIn and onFocusIn 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 (e09b121).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4259   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files         888      888           
  Lines       26031    26038    +7     
  Branches     9411     9412    +1     
=======================================
+ Hits        25343    25350    +7     
- Misses        641      682   +41     
+ Partials       47        6   -41     

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