fix(HaRP): do not block HaRP itself if requests contain a non-existent application #677
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Current code can block HaRP itself very easy, just by sending requests like
curl http://nextlcoud.local/exapps/non-ex-appThis requests will hit HaRP and HaRP will call
getExAppMetadataendpoint which will ban it temporary.It is fine just to reply with 404 for such requests from AppAPI, and move auto-ban to the HaRP key failure validation attempts.
We should backport this to NC32.