Load MessageLoggerMiddleware based on logger's effective level

[josumoreno-BP]

Summary

Fixes #1958

I did an isolated test for this one, but if you think that I should merge this one with test_config_log_level and check there both (level and effective level) let me know.

I've not updated the documentation because I feel that it is not needed for this one.

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[Kludex]

Thanks 👍

[josumoreno-BP]

Ups, I see that this failed. I only tested it isolated and worked.

I've been checking what is going on to suffer side effects from other tests and the reality is that once a test has loaded the default config I cannot use None as a parameter for uvicorn_logger_level because it will not "override" the existing level (see here). Even trying to set it to None is an error, but in this case passed inadvertent because python ignores it.

So I'm sending an amend removing that None from uvicorn_logger_level parameters.

[Kludex]

Thanks @josumoreno-BP 🙏