Flaky Test: Test/ServerFailureMetrics_BeforeResponseRecv

[purnesh42H]

https://github.com/grpc/grpc-go/actions/runs/14180815570/job/39726304420?pr=8183

Test introduced in #8203

[janardhanvissa]

https://github.com/grpc/grpc-go/actions/runs/14201703874/job/39789971243?pr=8056

[purnesh42H]

https://github.com/grpc/grpc-go/actions/runs/14214736698/job/39828723661?pr=8183