docs(samples): Adding samples for delete protection

[m-strzelczyk]

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Fixes b/202503927 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• samples/snippets/sample_delete_protection.py:14, tag compute_delete_protection_create
• samples/snippets/sample_delete_protection.py:19, tag compute_delete_protection_get
• samples/snippets/sample_delete_protection.py:20, tag compute_delete_protection_set
• samples/snippets/sample_delete_protection.py:21, tag compute_delete_protection_create
• samples/snippets/sample_delete_protection.py:29, tag compute_delete_protection_create
• samples/snippets/sample_delete_protection.py:98, tag compute_delete_protection_set
• samples/snippets/sample_delete_protection.py:128, tag compute_delete_protection_get

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[m-strzelczyk]

@busunkim96 There's somethign wrong with the Python 3.6 check. Can we do something about it?