Fix possible panic in the ipcache when removing the prefix labels for an unknown resource ID #25230
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This PR introduces a sanity check to avoid accessing the ipcache metadata map entry for a given prefix during removal if the corresponding resource ID was not present, since that would cause a panic.
Marking with
release-note/misc
since I'm not sure whether this bug could happen with "legitimate" usage. I experienced it after creating a custom endpointslice for the kubernetes service for testing purposes.