fix: Makes button dropdown main action clickable with Enter

[pan-kot]

Description

When a button dropdown is rendered with main action only (for test utils consistency) the main action wasn't clickable with enter. The PR fixes that.

Rel: [baiAA7LWUcov]

How has this been tested?

• New integration test

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 96.20%. Comparing base (7693793) to head (dc8d6b8).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2897      +/-   ##
==========================================
- Coverage   96.21%   96.20%   -0.01%     
==========================================
  Files         761      761              
  Lines       21490    21490              
  Branches     7359     7349      -10     
==========================================
- Hits        20676    20675       -1     
- Misses        761      762       +1     
  Partials       53       53              

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[jperals]

Since this feature is meant for an internal usage of property filter only, I would be more inclined to test this as part of property filter functionality, rather than making a case for a standalone button dropdown with only main action which in reality we don't expose as a user experience —it is an implementation detail. But this is not a blocker

[pan-kot]

I'd rather keep it here as the internal API of the component still belongs to it, I think - that is because from the property filter perspective I'd expect that behaviour to just work. If there was a test verifying the "Add filter" button can be clicked with Enter - that test would require a comment to state why is it needed as otherwise we might refactor it to use click interaction instead as it is simpler to code. It is also more challenging to setup an integ test for the property filter and in unit test the button click is not triggering if casting Enter keypress.