GrpcTemplate is quarantined

[wtgodbe]

The SDK now gives warnings for C# variables with all lowercase names - Grpc Protobuf auto-generates such variable names, so we've had to suppress the warning in a bunch of places & quarantine the GrpcTemplate test. Once grpc/grpc#29672 is resolved & we can ingest a package with the fix, we should undo the NoWarn additions from #41697 & un-quarantine GrpcTemplate

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