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maps: remove configmap

`pkg/maps/configmap`, added in #6208, was used to add a means of looking up
information regarding endpoint configuration that could be plumbed before
compilation was performed, specifically that related to policy. The only use of
it in the datapath was for IPv4 ingress, to allow all based off of the state in
the configmap instead of checking the policymap for the given endpoint. This was
useful for when we had to do a compilation per-endpoint when Cilium was under
high load. But, now that we have the ELF templating + an allow-all for endpoints
being represented by a single PolicyMap entry, we do not have to worry about
such cases anymore. Remove the configmap accordingly and all references to it
from the datapath and from `pkg/endpoint`. Be sure to clean up old instances of
it after regeneration has succeeded for an endpoint, as well as in the stale map
cleanup function so that we do not leave old configmaps behind on the
filesystem.

Signed-off by: Ian Vernon <ian@cilium.io>

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