<fix>[ha]: ZSTAC-84992 direct-pick HA pre-fence core to 5.4.12 (@@3)

[MatheMatrix]

Summary

Backport the ZSTAC-84992/ZSTAC-83890 HA pre-fence core changes to 5.4.12 by direct cherry-pick.

Changes

• Adds core pre-fence system tag handling and peer requirement for suspect-host HA start.
• Updates VM start-on-hypervisor flow and HA start message/extension contract.

Cherry-picked commits

• e6d9f59 <fix>[ha]: stabilize suspect host pre-fence flow
• 3845ee6 <fix>[ha]: create pre-fence tag in core
• b894009 <fix>[ha]: require peer for pre-fence tag

Testing

• git diff --check upstream/5.4.12..HEAD

Resolves: ZSTAC-84992

sync from gitlab !10528

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📥 Commits

Reviewing files that changed from the base of the PR and between dc33d7f and b894009.

📒 Files selected for processing (5)

• compute/src/main/java/org/zstack/compute/vm/VmInstanceBase.java
• compute/src/main/java/org/zstack/compute/vm/VmStartOnHypervisorFlow.java
• compute/src/main/java/org/zstack/compute/vm/VmSystemTags.java
• header/src/main/java/org/zstack/header/vm/HaStartVmInstanceMsg.java
• header/src/main/java/org/zstack/header/vm/VmBeforeStartOnHypervisorExtensionPoint.java

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch sync/yingzhe.hu/cp/5.4.12/ZSTAC-84992-direct-pick-20260714@@3

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