Update UsageData to report usage of instance integrations
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### About
`UsageData` currently reports [active instance integrations](https://gitlab.com/gitlab-org/gitlab/-/blob/aa39a6ea93f4aa62f2e3dbc1f8fd364431559edc/lib/gitlab/usage_data.rb#L227).
As part of https://gitlab.com/groups/gitlab-org/-/epics/14638, instance integrations are being shifted out of the `Integration` model.
We want to update `UsageData` to be able to report on instance integrations once they have moved to new models.
issue