Reduce logging verbosity in GrpcSidecarFixture for organized test output

[Copilot]

CI test logs in Grpc.IntegrationTests were unreadable due to verbose ASP.NET Core/gRPC infrastructure logging drowning out actual test output. The original test failure from PR #551 was already fixed by PR #579.

Changes

• Configure GrpcSidecarFixture logging to filter out noisy infrastructure logs:
  • Default minimum level: Warning
  • Microsoft.DurableTask.Sidecar: Information (orchestration events)
  • Microsoft.Hosting.Lifetime: Information (app lifecycle)

Before/After

Before: Every gRPC request logged 4+ lines of routing/hosting diagnostics

After: Only relevant sidecar events (instance creation, orchestration completion, errors)

.ConfigureLogging(logging =>
{
    logging.SetMinimumLevel(LogLevel.Warning);
    logging.AddFilter("Microsoft.DurableTask.Sidecar", LogLevel.Information);
    logging.AddFilter("Microsoft.Hosting.Lifetime", LogLevel.Information);
})

Original prompt

investigate test failure in https://github.com/microsoft/durabletask-dotnet/actions/runs/20376967944/job/58557949619?pr=551 and fix, also the test logs are very disordered and hard to navigate, can you make it organized and easy to navigate

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