caching the CancellationToken will prevent race condition (#2125) #400

Job	Run time
test-slow (net7.0, tests/Proto.Cluster.Tests/*.csproj)	2m 51s
test-slow (net7.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	1m 16s
test-slow (net7.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	1m 27s
test-slow (net7.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	1m 22s
test-slow (net6.0, tests/Proto.Cluster.Tests/*.csproj)	2m 48s
test-fast (tests/Proto.Actor.Tests/*.csproj)	1m 8s
test-slow (net6.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	1m 15s
test-slow (net6.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	1m 29s
test-fast (tests/Proto.Remote.Tests/*.csproj)	57s
test-slow (net6.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	1m 25s
test-fast (tests/Proto.OpenTelemetry.Tests/*.csproj)	51s
test-fast (tests/Proto.Cluster.CodeGen.Tests/*.csproj)	38s
nuget	1m 53s
	19m 20s

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