fix: convert FeatureFlag Index.js file to Index.tsx

[2nikhiltom]

Closes #17589

Convers Index.js to Index.tsx

Changelog

Added FeatureFlagsProps interface

Testing / Reviewing

Verify no errors in console
ensure functionality is interact

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.03%. Comparing base (29a4646) to head (eca9469).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17600   +/-   ##
=======================================
  Coverage   77.03%   77.03%           
=======================================
  Files         408      408           
  Lines       13993    13993           
  Branches     4301     4301           
=======================================
  Hits        10779    10779           
  Misses       3042     3042           
  Partials      172      172           

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[riddhybansal]

LGTM