fix: migrate bq/datatransfer/v1 to grpc_service_config

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PiperOrigin-RevId: 320218003
Source-Link: googleapis/googleapis@8dd269f

[codecov]

Codecov Report

Merging #239 into master will increase coverage by 0.32%.
The diff coverage is 86.28%.

@@             Coverage Diff              @@
##             master     #239      +/-   ##
============================================
+ Coverage     74.35%   74.68%   +0.32%     
  Complexity      108      108              
============================================
  Files             7        7              
  Lines           936      948      +12     
  Branches         18       18              
============================================
+ Hits            696      708      +12     
  Misses          220      220              
  Partials         20       20              

Impacted Files	Coverage Δ	Complexity Δ
...y/datatransfer/v1/DataTransferServiceSettings.java	12.72% <0.00%> (ø)	2.00 <0.00> (ø)
.../datatransfer/v1/stub/DataTransferServiceStub.java	5.26% <0.00%> (ø)	1.00 <0.00> (ø)
...ery/datatransfer/v1/DataTransferServiceClient.java	61.88% <68.42%> (ø)	57.00 <16.00> (ø)
...nsfer/v1/stub/DataTransferServiceStubSettings.java	81.54% <95.31%> (+0.85%)	24.00 <3.00> (ø)
...atransfer/v1/stub/GrpcDataTransferServiceStub.java	96.15% <100.00%> (ø)	21.00 <3.00> (ø)

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