[WIP] Replace deprecated findDOMNode call

[coelhucas]

Summary

Closes #9043 by replacing the deprecated .findDOMNode call with the useRef React hook.

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[thymikee]

Is there anything more you'd like to add, that it's still WIP? :) LGTM so far, just make sure tests are still passing

tests need to be fixed

[SimenB]

This was fixed in #9124. Thanks for the PR though!

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