Associate clusters model to groups
Even though we currently only should have one group for a cluster, we allow the flexibility to associate to other groups in the future. This also matches the runner <=> groups association. - Adds Cluster#first_group, aliased to Cluster#group. For the conceivable future, a cluster will have at most one group. - Prevent mixing of group and project clusters. If project type clusters, it should only have projects assigned. Similarly with groups. - Default cluster_type to :project_type. As it's very small table we can set default and null: false in one release.
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