<fix>[ha]: ZSTAC-84992 backport HA pre-fence core to 5.4.10 (@@3)

[ZStack-Robot]

Summary

Backport HA pre-fence core changes for ZSTAC-84992 to 5.4.10.

Notes

• Source branch intentionally matches the premium and zstack-utility MRs: cp/5.4.10/ZSTAC-84992-20260707@@3.
• Supersedes the previous MR created with a repo-specific source branch name.

Resolves: ZSTAC-84992

sync from gitlab !10457

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📥 Commits

Reviewing files that changed from the base of the PR and between af7a911 and eee95cb.

📒 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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