Core-http:deprecated warnings removed

[abhinav-qlogic]

work towards #4384

[sduskis]

Please fix the test failure:

[ERROR]   SessionPoolTest.testSessionNotFoundReadWriteTransaction:699 expected: com.google.cloud.spanner.TransactionRunnerImpl$TransactionContextImpl@12359a82
but was : Mock for TransactionContextImpl, hashCode: 1046545660

[abhinav-qlogic]

Please fix the test failure:

[ERROR]   SessionPoolTest.testSessionNotFoundReadWriteTransaction:699 expected: com.google.cloud.spanner.TransactionRunnerImpl$TransactionContextImpl@12359a82
but was : Mock for TransactionContextImpl, hashCode: 1046545660

failing test case is unrelated to changes

[codecov]

Codecov Report

Merging #5407 into master will increase coverage by 0.27%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5407      +/-   ##
============================================
+ Coverage     50.48%   50.75%   +0.27%     
- Complexity    23875    24801     +926     
============================================
  Files          2258     2271      +13     
  Lines        227486   233624    +6138     
  Branches      24978    25568     +590     
============================================
+ Hits         114838   118583    +3745     
- Misses       104029   106467    +2438     
+ Partials       8619     8574      -45

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/logging/spi/v2/GrpcLoggingRpc.java	37.01% <0%> (-6.11%)	1% <0%> (ø)
...loud/compute/v1/CreateSnapshotDiskHttpRequest.java	22.17% <0%> (-3.39%)	13% <0%> (+3%)
...rc/main/java/com/google/cloud/compute/v1/Disk.java	30.23% <0%> (-1.5%)	42% <0%> (+6%)
...com/google/cloud/redis/v1/stub/CloudRedisStub.java	6.66% <0%> (-1.03%)	2% <0%> (+1%)
...oogle/cloud/redis/v1beta1/stub/CloudRedisStub.java	6.66% <0%> (-1.03%)	2% <0%> (+1%)
...atransfer/v1/stub/GrpcDataTransferServiceStub.java	94.94% <0%> (-0.94%)	36% <0%> (+16%)
...google/cloud/redis/v1/stub/GrpcCloudRedisStub.java	91.69% <0%> (-0.52%)	27% <0%> (+13%)
...java/com/google/cloud/compute/v1/Interconnect.java	34.49% <0%> (-0.15%)	43% <0%> (+14%)
...oogle/cloud/compute/v1/InterconnectAttachment.java	36.05% <0%> (-0.08%)	57% <0%> (+26%)
...pute/v1/InterconnectDiagnosticsLinkLACPStatus.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 108 more

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