Vendorize fastapi-utls.cbv

[jdavcs]

Ref #17185
Supersedes #17202

This copies the one part of fastapi-utils that we use.

How to test the changes?

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

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[jmchilton]

Beautiful. I really appreciate you doing this @jdavcs - it means a lot to me.