Use ruamel.yaml.clib as default

[LecrisUT]

It seems the only thing we need to do to enable this is to pull in this dependency and switch to using safe type by default. This would be a better apple-to-apple comparison with #4486 since that one uses a C library for handling json.

Reference:

• Upstream documentation: https://yaml.dev/doc/ruamel.yaml/

---

Pull Request Checklist

• implement the feature
• include a release note

Related to #4406

[gemini-code-assist]

Code Review

This PR enables ruamel.yaml.clib by default by adding it as a dependency and setting the default YAML type to 'safe'. A suggestion is provided for tmt/utils/__init__.py to improve conciseness. Add a release note for this performance improvement.

[gemini-code-assist]

Combine these lines for conciseness.

Suggested change

	yaml_type = yaml_type or "safe"
	yaml = YAML(typ=yaml_type)
	yaml = YAML(typ=yaml_type or "safe")

[graphite-app]

Making ruamel-yaml-clib an unconditional dependency will break installations on non-CPython implementations (PyPy, Jython, etc.) since it's a C extension only available for CPython. The removed marker in pylock.toml (line 2405) previously restricted it to platform_python_implementation == 'CPython'.

This should be:

"ruamel-yaml-clib; platform_python_implementation == 'CPython'",

Without this marker, pip install will fail on PyPy and other implementations where the C extension cannot be compiled/installed.

Suggested change

	"ruamel-yaml-clib",
	"ruamel-yaml-clib; platform_python_implementation == 'CPython'",

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[LecrisUT]

Interesting observation. We are implying CPython in many other places though due to other dependencies. Will keep it open for discussions

[LecrisUT]

/packit test