Validate FK for ci_pipelines.auto_canceled_by_id

What does this MR do and why?

Validate FK fk_262d4c2d19_p for ci_pipelines.auto_canceled_by_id

• Async FK validation is done (see https://console.postgres.ai/gitlab/gitlab-production-ci/sessions/30669/commands/95286)

MR acceptance checklist

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #436529 (closed)