Collect usage pings `Gcp::Cluster.enabled` and `Gcp::Cluster.disabled`, instead of `Gcp::Cluster.count`

Fixes gitlab-org/gitlab-ce#37648

When sending the usage data, it now includes all pipelines. This commit
will split the pipelines in two; internal and external.

This will lead to historical data being incorrectly marked this way.

Fixes gitlab-org/gitlab-ce#33172

As its hard to reliably check how many review apps there are on the
clients machine, we start by checking where the type is `review`. This
means the folder is called that way. This will lead to a seq
scan on the table. However, this is done once a week, so the benefit of
adding an index seems not to apply here.

This query was timing out and is blocking the sync of usage data for
GitLab.com

CE port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1521

This query is constantly generating timeout errors on large installations and we don't
have a simple solution for now and also we don't think having this counter is
really critical.

CE port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/735