ZSTAC-84636 backport VM HA orphaned skip-trace fix

[zstack-robot-2]

Root cause:

When a management node leaves, its VM skip-trace entries are removed immediately. If kvmagent is still processing VM start operations from that management node, the next VM sync may see those VMs as stopped and trigger HA, causing split-brain.

Fix:

• Move departed management node skip-trace entries into an orphaned set instead of deleting them immediately.
• Include orphaned entries in VM sync skip lists.
• Keep orphaned entries skipped for a configurable TTL.
• Add kvm.vm.orphanedSkipTimeout with default value 600 seconds.
• Use compare-and-remove cleanup to avoid racing with refreshed orphan entries.

Verification:

• git diff --check
• mvn -pl plugin/kvm -am -DskipTests compile

Jira: ZSTAC-84636
Related: ZSTAC-80821

sync from gitlab !10401

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📒 Files selected for processing (2)

• plugin/kvm/src/main/java/org/zstack/kvm/KVMGlobalConfig.java
• plugin/kvm/src/main/java/org/zstack/kvm/KvmVmSyncPingTask.java

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