[WIP] Centralize yaml configurations into conda_build.yaml

[kenodegard]

Description

PyYAML uses interesting defaults that we've often sought to override (e.g., yaml.dump(default_flow_style=False)). To ensure we do a better job of consistently applying the same standard to all of our yaml.load/yaml.dump calls we introduce conda_build.yaml with all of our customizations.

Extends #5284

Checklist - did you ...

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• Add / update outdated documentation?

[codspeed-hq]

CodSpeed Performance Report

Merging #5285 will not alter performance

_{Comparing kenodegard:yaml (52aae52) with main (b1310ca)}

Summary

✅ 3 untouched benchmarks