Revert "migrate code from googleapis/python-security-private-ca"

[rsamborski]

Reverts #9028 as it was merged with automerge without preserving the commit history.

[snippet-bot]

Here is the summary of changes.

You are about to delete 23 region tags.

• privateca/snippets/activate_subordinate_ca.py:17, tag privateca_activate_subordinateca
• privateca/snippets/create_ca_pool.py:17, tag privateca_create_ca_pool
• privateca/snippets/create_certificate.py:17, tag privateca_create_certificate
• privateca/snippets/create_certificate_authority.py:17, tag privateca_create_ca
• privateca/snippets/create_certificate_csr.py:17, tag privateca_create_certificate_csr
• privateca/snippets/create_certificate_template.py:17, tag privateca_create_certificate_template
• privateca/snippets/create_subordinate_ca.py:17, tag privateca_create_subordinateca
• privateca/snippets/delete_ca_pool.py:17, tag privateca_delete_ca_pool
• privateca/snippets/delete_certificate_authority.py:17, tag privateca_delete_ca
• privateca/snippets/delete_certificate_template.py:17, tag privateca_delete_certificate_template
• privateca/snippets/disable_certificate_authority.py:17, tag privateca_disable_ca
• privateca/snippets/enable_certificate_authority.py:17, tag privateca_enable_ca
• privateca/snippets/filter_certificates.py:17, tag privateca_filter_certificate
• privateca/snippets/list_ca_pools.py:17, tag privateca_list_ca_pool
• privateca/snippets/list_certificate_authorities.py:17, tag privateca_list_ca
• privateca/snippets/list_certificate_templates.py:17, tag privateca_list_certificate_template
• privateca/snippets/list_certificates.py:17, tag privateca_list_certificate
• privateca/snippets/monitor_certificate_authority.py:17, tag privateca_monitor_ca_expiry
• privateca/snippets/revoke_certificate.py:20, tag privateca_revoke_certificate
• privateca/snippets/undelete_certificate_authority.py:17, tag privateca_undelete_ca
• privateca/snippets/update_ca_pool_issuance_policy.py:17, tag privateca_set_issuance_policy
• privateca/snippets/update_certificate_authority.py:17, tag privateca_update_ca_label
• privateca/snippets/update_certificate_template.py:17, tag privateca_update_certificate_template

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