fix(gw): widen duration histograms and cleanup #265
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This PR
fix: widens the duration histogram by adding buckets that cover durations between 1-30 minutes (geometric progression, closes remaining issues from Fix CAR and other metrics ipfs-inactive/bifrost-gateway#76)
cleanup: removes deprecated and unused legacy histograms: after feat: refactor gateway api to operate on higher level semantics #176 and feat(gateway): IPFSBackend metrics and HTTP range support #245 we now have api_call_duration_seconds histograms for higher resolution info per backend operation