chore: [BigQueryDataTransfer] remove unused imports (#5202)
chore: [BigQueryDataTransfer] remove unused imports (#5202)

* chore: remove unused imports

PiperOrigin-RevId: 438616112

Source-Link: https://github.com/googleapis/googleapis/commit/33dd46bddd2c97275cf8fbcf4ee1dc4e68b211da

Source-Link: https://github.com/googleapis/googleapis-gen/commit/93fe738d2f41c8efe33235c96ec32f2ba75bf21f
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googleapis/google-cloud-php,googleapis/google-cloud-php,googleapis/google-cloud-php