chore: remove samples

[meredithslota]

Samples have migrated here: https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/scheduler/snippets Do not merge until snippetbot is happy.

[snippet-bot]

Here is the summary of changes.

You are about to delete 4 region tags.

• samples/snippets/app.yaml:15, tag cloudscheduler_python_yaml
• samples/snippets/create_job.py:18, tag cloudscheduler_create_job
• samples/snippets/create_job.py:54, tag cloudscheduler_delete_job
• samples/snippets/main.py:17, tag cloudscheduler_app

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[cojenco]

LGTM, thank you!

[cojenco]

I checked earlier today and snippetbot has picked up the migration. Ready to merge whenever samples owners approve :)

[dandhlee]

LGTM, one comment.