fix: return updated combobox ref in click diffSnapshot

[Ishneet0710]

Summary

• Fixes combobox click to return the updated combobox ref in diffSnapshot
• When clicking a combobox, the ref may change after click (DOM re-render)
• Now finds the new ref by aria-label or [expanded] state and prepends it to diffSnapshot

Test plan

• Tested with Google Flights combobox
• Verified diffSnapshot now includes combobox line with new ref

Closes #3471

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/combobox-click-return-updated-ref

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[YunfeiZHAO]

LGTM,
Just in viewport mode, it may include elements outside the viewport in diffsnapshot, but it is not import for my point of view.