chore: Add ThreadingDiagnoserTests with InProcessToolchain

[filzrev]

Currently, ThreadingDiagnoserTests with InProcessEmitToolchain is commented out with following commit.
852bb8c

This PR enable these tests that use InProcessToolin.
Because it seems works without problem on latest codebase (As far as I've tested)

By this changes, it can implement skip long-running tests on Draft PR (#3088) (Currently, it takes about 4 minutes)

[filzrev]

On latest master CI.
CompletedWorkItemCountIsAccurate test failed on macos(arm64) with following error.

Error message

CompletedWorkItemCountIsAccurate(toolchain: InProcessEmitToolchain) [FAIL]
       Assert.Equal() Failure: Values are not within 2 decimal places
       Expected: 1 (rounded from 1)
       Actual:   1.02 (rounded from 1.015625)

The following actions are required to fix this issue.

1. Revert this PR commit
2. Reduce precision when comparing metrics value (Because original CompletedWorkItemCount/LockContentionCount value is integer)

   BenchmarkDotNet/tests/BenchmarkDotNet.IntegrationTests/ThreadingDiagnoserTests.cs

   Line 182 in d11792c

   Assert.Equal(assertion.Value.expectedValue, metric.Value.Value, precision: 2);

   .