refactor: clean up cloud_scheduler samples

[MonochromaticCoder]

b/280881402

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• cloud_scheduler/snippets/app.yaml:15, tag cloudscheduler_python_yaml
• cloud_scheduler/snippets/create_job.py:15, tag cloudscheduler_create_job
• cloud_scheduler/snippets/delete_job.py:15, tag cloudscheduler_delete_job
• cloud_scheduler/snippets/main.py:17, tag cloudscheduler_app

You are about to delete 4 region tags.

• scheduler/snippets/app.yaml:15, tag cloudscheduler_python_yaml
• scheduler/snippets/create_job.py:15, tag cloudscheduler_create_job
• scheduler/snippets/delete_job.py:15, tag cloudscheduler_delete_job
• scheduler/snippets/main.py:17, tag cloudscheduler_app

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