Use st2common meta safe YAML helpers in clone_action_files

[kateolenya]

Switch from plain yaml.load and yaml.dump to the meta helpers for consistency.

Refs #6393

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[kateolenya]

test fail is unfortunate but unrelated,

ProcessExecutionFailure: Process 'Building pytest.pex' failed with exit code 1.

edit:

orquestas hash has changed, which locks CI (lockfiles/st2.lock) before pants tests are run