fix(UserSearchField): extract key prop from renderOption spread

[Sbragul26]

Notes for Reviewers

This PR fixes #1624 . It fixes the failing hideRootObjectTitle test by ensuring the expected title is returned.
All tests are passing successfully.

Test Results

Signed commits

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[gemini-code-assist]

Code Review

This pull request updates a test assertion in "hideRootObjectTitle.test.tsx" to reflect the canonical import-design root title behavior, and modifies "UserSearchFieldInput.tsx" to destructure and apply a key to the list item in "renderOption". The reviewer recommends using the internally generated "key" from MUI's "props" in "renderOption" instead of "option.userId" to ensure proper compatibility and accessibility.

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