Limit logging config to CLI

[kenodegard]

Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

Only apply logging defaults/config when conda-build's CLI entrypoints are called (e.g. the conda_build.cli.main_*.execute functions).

Why is this needed?

Conda-build is not only a CLI application. It is also a library and downstream applications import from it and use the API. This means we should not be setting any logging defaults or otherwise customizing the logging and rather defer to the downstream applications and allow them to control logging as they see fit.

Efforts are already underway to improve conda's logging with much of the same mindset (see conda/conda#13541, conda/conda#13735, and conda/conda#13732).

While working on this we need to beware prior art, e.g., #2106.

What should happen?

• Remove logging customization that occurs upon import:

  conda-build/conda_build/cli/main_convert.py

  Line 16 in 6982cbd

  logging.basicConfig(level=logging.INFO)

  conda-build/conda_build/utils.py

  Lines 1661 to 1667 in 6982cbd

  	# set filelock's logger to only show warnings by default
  	logging.getLogger("filelock").setLevel(logging.WARN)
  	# quiet some of conda's less useful output
  	logging.getLogger("conda.core.linked_data").setLevel(logging.WARN)
  	logging.getLogger("conda.gateways.disk.delete").setLevel(logging.WARN)
  	logging.getLogger("conda.gateways.disk.test").setLevel(logging.WARN)

• Only "initialize" logging when conda-build CLI entrypoints are invoked.

Additional Context

No response