Use sentry-fastapi integration, expose sampling rate

[mvdbeek]

That's the recommended way for FastAPI apps (https://docs.sentry.io/platforms/python/guides/quart/configuration/integrations/asgi/, https://docs.sentry.io/platforms/python/guides/fastapi/). Like #15548 it only adds extra information on ASGI routes.
Also exposes the traces_sample_rate setting for potential performance measurement details:

How to test the changes?

(Select all options that apply)

• 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

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[nsoranzo]

The "Test Galaxy Packages" build failure was a real one here, this build is now failing on the dev branch.