samples(storage_transfer): Add samples for storage transfer services

[shubhangi-google]

Adding samples and acceptance tests for following storage transfer services:

• Storagetransfer_manifest_request
• storagetransfer_create_event_driven_gcs_transfer
• Storagetransfer_transfer_from_posix
• Storagetransfer_quickstart
• Storagetransfer_transfer_to_nearline
• storagetransfer_download_to_posix
• storagetransfer_transfer_posix_to_posi
• Storagetransfer_get_latest_transfer_operation

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 7 region tags.

- [google-cloud-storage_transfer/samples/check_latest_transfer_operation.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/check_latest_transfer_operation.rb#L15), tag `storagetransfer_get_latest_transfer_operation` - [google-cloud-storage_transfer/samples/event_driven_gcs_transfer.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/event_driven_gcs_transfer.rb#L15), tag `storagetransfer_create_event_driven_gcs_transfer` - [google-cloud-storage_transfer/samples/manifest_request.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/manifest_request.rb#L15), tag `storagetransfer_manifest_request` - [google-cloud-storage_transfer/samples/nearline_request.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/nearline_request.rb#L15), tag `storagetransfer_transfer_to_nearline` - [google-cloud-storage_transfer/samples/posix_download_request.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/posix_download_request.rb#L15), tag `storagetransfer_download_to_posix` - [google-cloud-storage_transfer/samples/posix_to_posix_request.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/posix_to_posix_request.rb#L15), tag `storagetransfer_transfer_posix_to_posix` - [google-cloud-storage_transfer/samples/transfer_from_posix_request.rb:15](https://github.com/shubhangi-google/google-cloud-ruby/blob/86150f24801088b75605288110ad0057471677d2/google-cloud-storage_transfer/samples/transfer_from_posix_request.rb#L15), tag `storagetransfer_transfer_from_posix`

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[shubhangi-google]

A couple of nit comments.

resolved