Logging: Remove Color Message Extra Key

[jteppinette]

I am adding a work around in my custom logfmt formatter to exclude keys due to the color_message key being passed through to the custom color logging formatter.

I don't really see this as a real issue, but if there was another way to solve this problem, then anyone with a custom log formatter wouldn't receive this unnecessary key.

Here is my current log output without the customization to my logging formatter:

at=INFO msg="Started server process [97819]" color_message="Started server process [%d]"
at=INFO msg="Waiting for application startup."
at=INFO msg="Application startup complete."
at=INFO msg="Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)" color_message="Uvicorn running on %s://%s:%d (Press CTRL+C to quit)"