gitaly: Remove CommitsBetween wrapper
What does this MR do and why?
In commit ebab4f48 (gitaly_client: Reimplement #between
via
#list_commits
, 2021-11-11), we have reimplemented #between
via
#list_commits
such that the deprecated CommitsBetween RPC isn't used
in GitLab Rails anymore. What was missed though is that #between
isn't
being used at all anymore, and all previous callsites had already been
converted to use #list_commits
in the first place. The calls which
were still visible in Grafana thus weren't caused by Rails, but they
were instead caused by the Elasticsearch indexer.
Remove #between
altogether given that it's not in use. The feature
flag which has been introduced to convert this wrapper to instead use
#list_commits
is removed, too.
MR acceptance checklist
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