[23.0] Fix incorrect ASGI request host

[davelopez]

Fixes #16454

I'm sorry, I think I mistakenly used the wrong host. It was returning the client host but I believe it should have been the application host instead 🤦‍♂️

This was introduced in 22.01 should I target that branch instead?

How to test the changes?

• 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.

[mvdbeek]

Let's let the tests run here, but probably a good idea to backport

[mvdbeek]

I think baseURL might've looked different in older starlette versions, now that I think of it

[davelopez]

Thanks, Marius, I'll create the backport for 22.01