Add unit tests for MultiSearch component (#1896)

* Add unit tests for MultiSearch component per issue checklist

✅ Renders successfully with minimal required props
✅ Conditional rendering logic (loading states, suggestions display)
✅ Prop-based behavior (indexes, initialValue, placeholder, eventData)
✅ Event handling (typing, clicking, keyboard navigation)
✅ State changes / internal logic (search query, highlights, suggestions)
✅ Default values and fallbacks (empty/undefined eventData)
✅ Text and content rendering (proper suggestion display)
✅ Handles edge cases and invalid inputs (empty results, missing properties)
✅ Accessibility roles and labels (ARIA attributes, focus management)
✅ DOM structure / classNames / styles (CSS class verification)

- Fix TypeScript issues by replacing 'any' types with proper annotations
- Add comprehensive test coverage following AutoScrollToTop.test.tsx structure
- Mock all external dependencies and ensure proper cleanup

Completes all Essential Test Coverage Checklist requirements.

* Fix: Added comprehensive unit tests for ContributorAvatar component

* Fix Spell check

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Co-authored-by: Kate Golovanova <[email protected]>

Author: RizWaaN3024