fix: Ensure hovered (multi)select items aren't selected when typing space

[gethinwebster]

Description

Ensure that items aren't selected when typing a space after having hovered an item with the mouse

Related links, issue #, if available: AWSUI-61276

How has this been tested?

New integ tests

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 97.16%. Comparing base (a4a22ce) to head (3b24d8c).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3902   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files         850      850           
  Lines       24776    24776           
  Branches     8732     8732           
=======================================
  Hits        24073    24073           
  Misses        654      654           
  Partials       49       49           

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