chore: snippet-bot full scan

[tmatsuo]

For local development testing

snippet-bot scan result

Life is too short to manually check unmatched region tags.
Here is the result:

• spanner/cloud-client/snippets.py:765, tag spanner_field_access_on_struct_parameters has already started
• spanner/cloud-client/snippets.py:744, tag spanner_field_access_on_struct_parameters doesn't have a matching end tag
• iam/api-client/service_accounts.py:35, tag iam_list_service_accounts doesn't have a matching start tag
• iam/api-client/service_accounts.py:24, tag iam_list_service_account doesn't have a matching end tag
• functions/billing/requirements.txt:4, tag functions_billing_limit_appengine_deps has already started
• functions/billing/requirements.txt:2, tag functions_billing_limit_appengine_deps doesn't have a matching end tag
• appengine/standard_python3/building-an-app/building-an-app-1/main.py:44, tag gae_python38_render_template has already started
• appengine/standard_python3/building-an-app/building-an-app-1/main.py:15, tag gae_python38_render_template doesn't have a matching end tag
• composer/workflows/hadoop_tutorial.py:106, tag composer_hadoop doesn't have a matching start tag
• composer/workflows/hadoop_tutorial.py:15, tag composer_hadoop_tutorial doesn't have a matching end tag
• storage/cloud-client/storage_disable_versioning.py:37, tag storage_enable_versioning doesn't have a matching start tag
• storage/cloud-client/storage_disable_versioning.py:19, tag storage_disable_versioning doesn't have a matching end tag
• appengine/standard/xmpp/xmpp.py:85, tag send-chat-to-user doesn't have a matching start tag
• appengine/standard/multitenancy/taskqueue.py:22, tag all doesn't have a matching end tag
• appengine/standard/firebase/firenotes/frontend/main.js:94, tag gae_python_firebase_login doesn't have a matching start tag
• appengine/standard/firebase/firenotes/frontend/main.js:74, tag configureFirebaseLoginWidget doesn't have a matching end tag
• storage/cloud-client/storage_set_metadata.py:37, tag storage_get_metadata doesn't have a matching start tag
• storage/cloud-client/storage_set_metadata.py:19, tag storage_set_metadata doesn't have a matching end tag

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