feat: Allow button dropdown items to have an external icon without requiring href

[avinashbot]

Description

Related links, issue #, if available: n/a

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.84%. Comparing base (b922cf1) to head (c604be4). Report is 269 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2691      +/-   ##
==========================================
- Coverage   95.84%   95.84%   -0.01%     
==========================================
  Files         744      744              
  Lines       20581    20581              
  Branches     7015     7015              
==========================================
- Hits        19726    19725       -1     
- Misses        847      848       +1     
  Partials        8        8              

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