feat: support regapic LRO (#550)
feat: support regapic LRO (#550)

PiperOrigin-RevId: 456946341
Source-Link: https://github.com/googleapis/googleapis/commit/88fd18d9d3b872b3d06a3d9392879f50b5bf3ce5
Source-Link: https://github.com/googleapis/googleapis-gen/commit/accfa371f667439313335c64042b063c1c53102e
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googleapis/nodejs-bigquery-data-transfer,googleapis/nodejs-bigquery-data-transfer,googleapis/nodejs-bigquery-data-transfer