Follow-up from "Reduce N+1 queries on deploy keys index page"

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The following discussion from !20970 (merged) should be addressed:

• @mayra-cabrera started a discussion: (+3 comments)

  Do we know why we can't do project.deploy_keys? 🤔

We need a unique index on DeployKeysProject to enforce the unique validation:

validates :deploy_key_id, uniqueness: { scope: [:project_id], message: "already exists in project" }