Quarantine ForeignKeysGenerator rspec

What does this MR do and why?

Quarantines failing foreign keys generator spec -- followup to !148592 (merged), since the failure is happening in the after context, so we're needing to quarantine the entire spec.

See #454333 (closed)

Incident: gitlab-com/gl-infra/production#17774 (closed)

changed milestone to %16.11

added backend maintenancepipelines pipeline:expedite quarantine labels

requested review from @dchevalier2, @at.ramya, and @tkuah

assigned to @jennykim-gitlab

added typemaintenance label

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backend	@mcavoj (UTC+2, 6 hours ahead of author)	@a_akgun (UTC+3, 7 hours ahead of author)

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approved this merge request

merged

mentioned in commit 125725b4

added workflowstaging-canary label

added workflowcanary label and removed workflowstaging-canary label

mentioned in merge request !147202 (merged)

added workflowproduction label and removed workflowcanary label

mentioned in merge request !148238 (merged)

added workflowstaging label and removed workflowproduction label

picked the changes into the branch cherry-pick-125725b4 with commit 6c6ea056

mentioned in commit 6c6ea056

mentioned in merge request !148687 (merged)

mentioned in incident gitlab-com/gl-infra/production#17774 (closed)

added workflowpost-deploy-db-staging label and removed workflowstaging label

mentioned in commit 13369789

added releasedcandidate label

added releasedpublished label and removed releasedcandidate label

added devopsverify groupci platform sectionci labels