[fix](fe) Cancel rebuilt VCG warm up jobs on drop

[deardeng]

Problem Summary: When active/standby switches for a virtual compute group, FE rebuilds periodic and event-driven file cache warm up jobs and writes new job ids to MS. FE memory kept stale cacheWarmupJobIds until a later MS sync, so a quick DROP VCG cancelled old ids and left rebuilt jobs running. This change makes updateFileCacheJobIds report MS update success, synchronizes the FE-local policy with rebuilt job ids after a successful update, and cancels newly created jobs if the MS update fails.

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

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• Test

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• Behavior changed:

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• Does this need documentation?

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  • Yes.

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