convert SearchResults/DiffSelection to functional component and improved testcases

[JeevaRamanathan]

Which problem is this PR solving?

• [Feature]: Refactor class components to functional components #2610

Description of the changes

• convert packages/jaeger-ui/src/components/SearchTracePage/SearchResults/DiffSelection.tsx from class to functional and improved test cases.

How was this change tested?

• Ensured there is no break in the functionality in UI
• Ran the test suite using npm run test to ensure all test cases pass.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: npm run lint and npm run test

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (30a402d) to head (8b0b079).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3076      +/-   ##
==========================================
- Coverage   98.14%   98.14%   -0.01%     
==========================================
  Files         257      257              
  Lines        8081     8080       -1     
  Branches     2039     2117      +78     
==========================================
- Hits         7931     7930       -1     
  Misses        150      150              

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