Flaky test: LocalAbortCompletesManagerDecisionAfterDispatchAndBeforeCleanupSettles

[ReubenBond]

Orleans.Transactions.Tests.TransactionRecoveryLatencyTests.LocalAbortCompletesManagerDecisionAfterDispatchAndBeforeCleanupSettles failed intermittently in the macOS net8.0 BVT job for PR #10569.

Failure

• Workflow run: https://github.com/dotnet/orleans/actions/runs/32356957973
• Job: https://github.com/dotnet/orleans/actions/runs/32356957973/job/96388104890
• PR head: a3488939144266cb1f194877bdba0bea77bc202f
• Environment: macos-latest, net8.0, BVT

Assert.True() Failure
Expected: True
Actual:   False

at Orleans.Transactions.Tests.TransactionRecoveryLatencyTests.LocalAbortCompletesManagerDecisionAfterDispatchAndBeforeCleanupSettles()

The test failed after approximately one second. The PR changes grain activation construction ordering and scheduler ownership; it does not modify transaction recovery code or this test. The corresponding transaction tests passed in local targeted validation and the other CI target/framework jobs.

Expected behavior

The manager decision should complete after dispatch and before cleanup settles deterministically across supported platforms and target frameworks.