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fix(informer): return nil instead of error in VM indexer to prevent client-go panic (#6537)

The "dv" and "pvc" indexer functions in GetVirtualMachineInformerIndexers()
returned errUnexpectedObject on type assertion failure. Since client-go's
indexer framework panics on non-nil errors from IndexFunc, this could crash
the controller process. All other indexer functions in the same file already
correctly return nil, nil. This aligns the two remaining indexers with that
pattern and removes the now-unused errUnexpectedObject variable.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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