chore(bus): cover serial queue processing

[yordis]

• Queue dispatch safety needs a regression signal for handlers that own mutable state.
• Scheduling cleanup is easier to review when the serial processing contract is covered directly.

[cursor]

PR Summary

Low Risk
Low risk: adds an isolated xUnit test only, with no production code changes; potential flakiness is limited to timing-based async waits.

Overview
Adds a new xUnit test QueuedHandlerThreadPoolTests.processes_messages_serially that publishes multiple messages to QueuedHandlerThreadPool and asserts they are handled one at a time (max concurrency = 1) and that all messages are processed.

The test uses a RecordingConsumer with a small async delay to detect concurrent execution and includes explicit queue start/stop with timeouts to act as a regression signal for the queue’s serial dispatch contract.

^{Reviewed by Cursor Bugbot for commit 8890826. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 59ef67e5-dd9a-4b1a-8167-9179f3a218be

📥 Commits

Reviewing files that changed from the base of the PR and between 3860089 and 8890826.

📒 Files selected for processing (1)

• src/EventStore.Core.XUnit.Tests/Bus/QueuedHandlerThreadPoolTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/chore-queue-serial-processing-tests

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