We should remove the code associated to GMA v1, which is not anymore reachable in our codebase. Having it there has caused confusion and some impact to our GitLab security release. [See internal](https://gitlab.slack.com/archives/CB07X8AQ3/p1656529011048149?thread_ts=1656522966.857279&cid=CB07X8AQ3). The UI used to managed cluster_applications was removed here: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/63348 This means removing all the `clusters_applications_*` related code. We should also drop the associated tables and API entities. Look for terms: ``` Clusters::Applications::Helm Clusters::Applications::Ingress Clusters::Applications::CertManager Clusters::Applications::Crossplane Clusters::Applications::Prometheus Clusters::Applications::Runner Clusters::Applications::Jupyter Clusters::Applications::Knative Clusters::Applications::ElasticStack Clusters::Applications::Cilium clusters_applications_ scope :with_persisted_applications, -> { eager_load(*APPLICATIONS_ASSOCIATIONS) } ClusterApplicationEntity ``` See places that call these which will probably be also deleted or partially deleted. Relevant Database Guidelines: https://docs.gitlab.com/ee/development/migration_style_guide.html#dropping-a-database-table