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Summary
This replaces the prior PR that created mocks for reactBootstrap. My concern was that I didn't want to bundle our own version of react-bootstrap, but Jest couldn't access the external version. @calebroseland pointed out that just putting it into package.json didn't cause it to be bundled, but did mean that the development and test environments could use it. Thanks Caleb!
-Changes the development and test versions of React, ReactDom, and react-test-renderer to the 18.2 version used in mattermost.
rendertocreateRootTicket Link
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Checklist
Gated by experimental feature flagUnit tests updated