[doc] use python 3.12 to perform policy check

[aslonnie]

It is technically still using the resolved dependencies of python
3.9, but all libraries used are version agnostic, it should run.

[aslonnie]

this is built on top of #58516

[gemini-code-assist]

Code Review

This pull request updates the Python version for the policy check to 3.12 and refactors several scripts to remove dependencies on ray_ci.utils and ray_release. The changes replace a custom logger with standard print statements to sys.stderr, which is a reasonable simplification for CI scripts. The logic for determining when to perform a dry run in cmd_build.py has also been simplified. I've suggested a small refactoring to make the dry_run logic even cleaner. Overall, the changes are well-aligned with the goal of updating the Python environment and reducing dependencies.

[gemini-code-assist]

The logic to determine dry_run can be simplified. By setting dry_run to True by default and only changing it to False when the conditions for an upload are met, you can make the code more concise and avoid repeating dry_run = True.

Suggested change

	dry_run = False
	if (
	os.environ.get("BUILDKITE_PIPELINE_ID")
	not in get_global_config()["ci_pipeline_postmerge"]
	):
	if os.environ.get("RAYCI_STAGE", "") != "postmerge":
	dry_run = True
	logger.info(
	"Not uploading build artifacts because this is not a postmerge pipeline."
	print(
	"Not uploading build artifacts because this is not a postmerge pipeline.",
	file=sys.stderr,
	)
	if os.environ.get("BUILDKITE_BRANCH") != "master":
	elif os.environ.get("BUILDKITE_BRANCH") != "master":
	dry_run = True
	logger.info(
	"Not uploading build artifacts because this is not the master branch."
	print(
	"Not uploading build artifacts because this is not the master branch.",
	file=sys.stderr,
	)
	dry_run = True
	if os.environ.get("RAYCI_STAGE", "") != "postmerge":
	print(
	"Not uploading build artifacts because this is not a postmerge pipeline.",
	file=sys.stderr,
	)
	elif os.environ.get("BUILDKITE_BRANCH") != "master":
	print(
	"Not uploading build artifacts because this is not the master branch.",
	file=sys.stderr,
	)
	else:
	dry_run = False

[aslonnie]

going to use python 3.10 instead.