Added samples related to Etags

[dhavalbhensdadiya-crest]

As part of this feature, we have added global and regional samples for below features:

1. Update Secret using Etag
2. Delete Secret using Etag
3. Disable Secret Version using Etag
4. Enable Secret Version using Etag
5. Destroy Secret Version using Etag

Please merge this PR once approved

[snippet-bot]

Here is the summary of changes.

You are about to add 14 region tags.

• secretmanager/src/delete_regional_secret_using_etag.php:28, tag secretmanager_delete_regional_secret_using_etag
• secretmanager/src/delete_secret_using_etag.php:28, tag secretmanager_delete_secret_using_etag
• secretmanager/src/destroy_regional_secret_version_using_etag.php:28, tag secretmanager_destroy_regional_secret_version_using_etag
• secretmanager/src/destroy_secret_version_using_etag.php:28, tag secretmanager_destroy_secret_version_using_etag
• secretmanager/src/disable_regional_secret_version_using_etag.php:28, tag secretmanager_disable_regional_secret_version_using_etag
• secretmanager/src/disable_secret_version_using_etag.php:28, tag secretmanager_disable_secret_version_using_etag
• secretmanager/src/enable_regional_secret_version_using_etag.php:28, tag secretmanager_enable_regional_secret_version_using_etag
• secretmanager/src/enable_secret_version_using_etag.php:28, tag secretmanager_enable_secret_version_using_etag
• secretmanager/src/list_regional_secret_versions_with_filter.php:28, tag secretmanager_list_regional_secret_versions_with_filter
• secretmanager/src/list_regional_secrets_with_filter.php:28, tag secretmanager_list_regional_secrets_with_filter
• secretmanager/src/list_secret_versions_with_filter.php:28, tag secretmanager_list_secret_versions_with_filter
• secretmanager/src/list_secrets_with_filter.php:28, tag secretmanager_list_secrets_with_filter
• secretmanager/src/update_regional_secret_using_etag.php:28, tag secretmanager_update_regional_secret_using_etag
• secretmanager/src/update_secret_using_etag.php:28, tag secretmanager_update_secret_using_etag

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