fix(tests): stabilize cluster restart on arm64

[yordis]

• ARM64 runners have less timing headroom while the full suite is under load.
• This fixture repeatedly restarts a three-node cluster, so noisy scheduling can produce false red builds unrelated to the PR being validated.
• Keeping this fixture isolated reduces wasted CI cycles on unrelated changes.

[cursor]

PR Summary

Low Risk
Low risk since changes are confined to a flaky integration test; main impact is longer timeouts and forcing non-parallel execution, which may increase CI time but shouldn’t affect production code.

Overview
Improves stability of the when_cluster_nodes_are_restarted integration fixture by disabling parallel execution and increasing timeouts on ARM64 via architecture detection.

The test now uses longer stabilization/restart/Given timeouts on ARM64 to reduce CI flakiness during repeated 3-node cluster restarts.

^{Reviewed by Cursor Bugbot for commit 41aa74d. 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: 1330c59c-7a0d-4ea3-b7eb-9d57818ce6d9

📥 Commits

Reviewing files that changed from the base of the PR and between b093a01 and 41aa74d.

📒 Files selected for processing (1)

• src/EventStore.Core.Tests/Integration/when_cluster_nodes_are_restarted.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-arm-cluster-restart-test

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