[WIP] Raw User Input: /project/metadata route

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

This work has already been started in the pull request #316. Please use the existing branch in that pull request to do the work.

/project/metadataRouter.js has the following registered endpoint.

.put(auth0Middleware(), async (req, res) => { ... })

The data provided in the request body was from direct typed user input. It may be malicious, or at least suspicious.

Add the middleware found in/utilities/checkIfSuspicious.js to the route in order to protect it. No new files should be generated as a result of this work.

Fixes #314.

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