Move CLI's logging initialization into a dedicated module

[kenodegard]

Description

Refactor conda_build.utils.get_logger into conda_build.cli.logging.init_logging and only call this initializer when the conda-build CLI entrypoints are invoked. When using conda-build as a library we do not set any logging defaults.

Resolves #5274 Xref #5415

Checklist - did you ...

• [x] Add a file to the news directory (using the template) for the next release's release notes?
• [x] Add / update necessary tests?
• [ ] ~Add / update outdated documentation?~

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #5275 will not alter performance

_{Comparing kenodegard:logging (105fcf8) with main (9c0ceec)}

Summary

✅ 3 untouched benchmarks

[jezdez]

@kenodegard this sadly needs a merge :-/