As this method does have `deployment_platform(environment: self.name)`,
which is what the form EE needs. Allows us to remove two overrides in
EE.

Immediate configuration is not ideal for group and instance
level clusters as projects that may never be deployed would
still have Kubernetes namespaces and service accounts created
for them.

As of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25586
we now create only the resources that are required for the
project being deployed, at the time of deployment.

Omit max-count for diverging_commit_counts behind feature flag

See merge request gitlab-org/gitlab-ce!28157

Sessions can be listed for a given user

See merge request gitlab-org/gitlab-ce!28306

Adds ActiveSession#session_ids_for_user for listing session IDs for a
given user, and adds ActiveSession#list_sessions for listing session
data directly.

Optimise upload path calls

See merge request gitlab-org/gitlab-ce!28264

We want to optimize the query for the CountDivergingCommits rpc by
removing the --max-count argument now that we have commit graphs
enabled for all repositories during housekeeping. However, we want to
test this first behind a feature flag.

String#underscore isn't particularly slow, but it's possible for us to
call it many times in a users autocomplete request, with mostly-static
values ('User', 'Group', etc.). We can memoise this and save a
surprising amount of time (around 10% of the total request time in some
cases).

Fix project visibility level validation

Closes #59379

See merge request gitlab-org/gitlab-ce!28305