Exclude PackObjectsHookWithSidechannel from Gitaly apdex
PackObjectsHookWithSidechannel is a new unary RPC that has the latency profile of streaming RPC's, so we should exclude it from the Gitaly apdex.
PackObjectsHookWithSidechannel is a new unary RPC that has the latency profile of streaming RPC's, so we should exclude it from the Gitaly apdex.