build: update README to indicate that source has moved and delete all files

[parthea]

Towards googleapis/google-cloud-python#10985.

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Here is the summary of changes.

You are about to delete 30 region tags.

• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_check_valid_creds_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_CheckValidCreds_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_check_valid_creds_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_CheckValidCreds_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_create_transfer_config_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_CreateTransferConfig_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_create_transfer_config_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_CreateTransferConfig_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_delete_transfer_config_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_DeleteTransferConfig_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_delete_transfer_config_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_DeleteTransferConfig_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_delete_transfer_run_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_DeleteTransferRun_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_delete_transfer_run_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_DeleteTransferRun_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_enroll_data_sources_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_EnrollDataSources_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_enroll_data_sources_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_EnrollDataSources_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_data_source_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetDataSource_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_data_source_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetDataSource_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_transfer_config_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetTransferConfig_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_transfer_config_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetTransferConfig_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_transfer_run_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetTransferRun_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_get_transfer_run_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_GetTransferRun_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_data_sources_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListDataSources_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_data_sources_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListDataSources_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_configs_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferConfigs_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_configs_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferConfigs_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_logs_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferLogs_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_logs_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferLogs_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_runs_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferRuns_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_list_transfer_runs_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ListTransferRuns_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_schedule_transfer_runs_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ScheduleTransferRuns_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_schedule_transfer_runs_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_ScheduleTransferRuns_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_start_manual_transfer_runs_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_StartManualTransferRuns_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_start_manual_transfer_runs_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_StartManualTransferRuns_sync
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_update_transfer_config_async.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_UpdateTransferConfig_async
• samples/generated_samples/bigquerydatatransfer_v1_generated_data_transfer_service_update_transfer_config_sync.py:26, tag bigquerydatatransfer_v1_generated_DataTransferService_UpdateTransferConfig_sync

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