Register "gitaly_delta_islands" feature flag
What does this MR do?
Gitaly server side feature flags do not work unless they are white-listed in Gitlab::GitalyClient. We created a feature flags for delta islands gitaly#1575 (closed) a while ago already, but we forgot to register the feature flag in gitlab-ce. This MR fixes that.
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation created/updated or follow-up review issue created -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Performance and testing
This change has no immediate production impact because the feature flag it registers is off by default.