<fix>[vm]: add conditional stop target precheck

[zstack-robot-2]

Route network-group stop requests through the VM actor.
Reuse allocator dry-run before the existing cold Stop flow.

Resolves: ZSTAC-87164
Test: HaNetworkGroupCoreFlowCase

Change-Id: I5b480ff0b8c643782c80136691e73223d8cf45c6

sync from gitlab !10668

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📥 Commits

Reviewing files that changed from the base of the PR and between a1ef8af and 04ffc8f.

⛔ Files ignored due to path filters (2)

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📒 Files selected for processing (3)

• compute/src/main/java/org/zstack/compute/vm/VmInstanceBase.java
• header/src/main/java/org/zstack/header/allocator/HostAllocationPurpose.java
• utils/src/main/java/org/zstack/utils/clouderrorcode/CloudOperationsErrorCode.java

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