Exclude PostUploadPackWithSidechannel from Gitaly latency SLI's
This is part of &463 (closed) and preparation for gitlab-com/gl-infra/scalability#1193.
We're not using this new RPC yet, but when we do, it should not count towards Gitaly latency SLI's, because how slow it is mainly depends on how much data a user is downloading with git fetch
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Edited by Jacob Vosmaer