delete pkg/hubble/ipcache and GetIPIdentity func from ipcache #11652
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This commit updates hubble parser's IPGetter interface so that the
interface methods match existing ones in cilium's ipcache package that
provide information that is necessary for hubble's parsers.
As a consequence, the GetIPIdentity method can be removed from cilium's
ipcache. This method was added when hubble was initially embedded into
cilium and never made its way to a cilium release.
Another consequence of this change is that package pkg/hubble/ipcache
can be removed entirely. It was a remnant from the time when hubble was
running as standalone and had to replicate its own IP cache from
cilium's.
This commit does not make functional changes.