feat(spanner): Replace Spanner Instance Admin samples (2/3)

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 18 region tags.

- [spanner/src/admin/archived/cancel_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/cancel_backup.php#L26), tag `spanner_cancel_backup_create` - [spanner/src/admin/archived/copy_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/copy_backup.php#L26), tag `spanner_copy_backup` - [spanner/src/admin/archived/create_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/create_backup.php#L26), tag `spanner_create_backup` - [spanner/src/admin/archived/create_backup_with_encryption_key.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/create_backup_with_encryption_key.php#L26), tag `spanner_create_backup_with_encryption_key` - [spanner/src/admin/archived/create_instance.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/create_instance.php#L26), tag `spanner_create_instance` - [spanner/src/admin/archived/create_instance_config.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/create_instance_config.php#L26), tag `spanner_create_instance_config` - [spanner/src/admin/archived/create_instance_with_processing_units.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/create_instance_with_processing_units.php#L26), tag `spanner_create_instance_with_processing_units` - [spanner/src/admin/archived/delete_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/delete_backup.php#L26), tag `spanner_delete_backup` - [spanner/src/admin/archived/delete_instance_config.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/delete_instance_config.php#L26), tag `spanner_delete_instance_config` - [spanner/src/admin/archived/get_instance_config.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/get_instance_config.php#L26), tag `spanner_get_instance_config` - [spanner/src/admin/archived/list_backup_operations.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/list_backup_operations.php#L26), tag `spanner_list_backup_operations` - [spanner/src/admin/archived/list_backups.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/list_backups.php#L26), tag `spanner_list_backups` - [spanner/src/admin/archived/list_instance_config_operations.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/list_instance_config_operations.php#L26), tag `spanner_list_instance_config_operations` - [spanner/src/admin/archived/list_instance_configs.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/list_instance_configs.php#L26), tag `spanner_list_instance_configs` - [spanner/src/admin/archived/restore_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/restore_backup.php#L26), tag `spanner_restore_backup` - [spanner/src/admin/archived/restore_backup_with_encryption_key.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/restore_backup_with_encryption_key.php#L26), tag `spanner_restore_backup_with_encryption_key` - [spanner/src/admin/archived/update_backup.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/update_backup.php#L26), tag `spanner_update_backup` - [spanner/src/admin/archived/update_instance_config.php:26](https://github.com/GoogleCloudPlatform/php-docs-samples/blob/1efefdc78a7d85682d6ed1a285d18cee7f1b9c7c/spanner/src/admin/archived/update_instance_config.php#L26), tag `spanner_update_instance_config`

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[vishwarajanand]

It would be easier to review if this PR is to be merged into new_spanner_admin_samples instead of main. If you can create a new PR that way, it would be great. Else, I can review it once #1966 is reviewed and merged.

[ajupazhamayil]

@vishwarajanand Changed the merge branch from main to new_spanner_admin_samples