refactor: Replaces findDomNode() with refs

[Abhi347]

Summary

As mentioned in #9043 usage of findDomeNode() is deprecated and have rule against its usage in ESLint. This PR Closes #9043 by removing findDomeNode() usage in the example and replaces it with createRef().

Since the test required accessing two different DOM nodes (label and input), ref forwarding is used for both of them

Test plan

yarn test

[Abhi347]

I have no idea why those 2 tests are failing on installation. Will it work if we rerun the tests?

[SimenB]

I restarted CI

[codecov-io]

Codecov Report

Merging #9124 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9124   +/-   ##
=======================================
  Coverage   64.73%   64.73%           
=======================================
  Files         277      277           
  Lines       11709    11709           
  Branches     2875     2875           
=======================================
  Hits         7580     7580           
  Misses       3512     3512           
  Partials      617      617

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[SimenB]

Thanks!

[github-actions]

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