samples: [storage-control] add folder samples for storage control

[ddelgrosso1]

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Fixes #5417 🦕

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 5 region tags.

- [packages/google-storage-control/samples/createFolder.js:18](https://github.com/googleapis/google-cloud-node/blob/b25ec0053da9ff60bd8b5a31e19d5bc575595a31/packages/google-storage-control/samples/createFolder.js#L18), tag `storage_control_create_folder` - [packages/google-storage-control/samples/deleteFolder.js:18](https://github.com/googleapis/google-cloud-node/blob/b25ec0053da9ff60bd8b5a31e19d5bc575595a31/packages/google-storage-control/samples/deleteFolder.js#L18), tag `storage_control_delete_folder` - [packages/google-storage-control/samples/getFolder.js:18](https://github.com/googleapis/google-cloud-node/blob/b25ec0053da9ff60bd8b5a31e19d5bc575595a31/packages/google-storage-control/samples/getFolder.js#L18), tag `storage_control_get_folder` - [packages/google-storage-control/samples/listFolders.js:19](https://github.com/googleapis/google-cloud-node/blob/b25ec0053da9ff60bd8b5a31e19d5bc575595a31/packages/google-storage-control/samples/listFolders.js#L19), tag `storage_control_list_folders` - [packages/google-storage-control/samples/renameFolder.js:19](https://github.com/googleapis/google-cloud-node/blob/b25ec0053da9ff60bd8b5a31e19d5bc575595a31/packages/google-storage-control/samples/renameFolder.js#L19), tag `storage_control_rename_folder`

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