feat(secretmanager): add regional secrets samples

[kapishps]

add samples of regional secrets for all methods

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 15 region tags.

• secretmanager/src/access_regional_secret_version.php:28, tag secretmanager_access_regional_secret_version
• secretmanager/src/add_regional_secret_version.php:28, tag secretmanager_add_regional_secret_version
• secretmanager/src/create_regional_secret.php:28, tag secretmanager_create_regional_secret
• secretmanager/src/delete_regional_secret.php:28, tag secretmanager_delete_regional_secret
• secretmanager/src/destroy_regional_secret_version.php:28, tag secretmanager_destroy_regional_secret_version
• secretmanager/src/disable_regional_secret_version.php:28, tag secretmanager_disable_regional_secret_version
• secretmanager/src/enable_regional_secret_version.php:28, tag secretmanager_enable_regional_secret_version
• secretmanager/src/get_regional_secret.php:28, tag secretmanager_get_regional_secret
• secretmanager/src/get_regional_secret_version.php:28, tag secretmanager_get_regional_secret_version
• secretmanager/src/list_regional_secret_versions.php:28, tag secretmanager_list_regional_secret_versions
• secretmanager/src/list_regional_secrets.php:28, tag secretmanager_list_regional_secrets
• secretmanager/src/regional_iam_grant_access.php:28, tag secretmanager_regional_iam_grant_access
• secretmanager/src/regional_iam_revoke_access.php:28, tag secretmanager_regional_iam_revoke_access
• secretmanager/src/update_regional_secret.php:28, tag secretmanager_update_regional_secret
• secretmanager/src/update_regional_secret_with_alias.php:28, tag secretmanager_update_regional_secret_with_alias

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[bshaffer]

@kapishps why was this closed?