For many Gitaly RPCs, previously the `gitaly_duration_s` log timings
only accounted for the initial request/response time.  We now measure
the total time it takes to consume the response for the following RPCs:

1. FindAllBranches
2. FindAllRemoteBranches
3. FindAllBranchNames
4. FindAllTagNames
5. ListNewCommits
6. ListNewBlobs
7. FindLocalBranches
8. FindAllTags
9. ListBranchNamesContainingCommit
10. GetTagMessages

This came up in https://gitlab.com/gitlab-org/gitlab/-/issues/222247.

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/30334