feat(sidekiq): move ProcessScanResultPolicyWorker to quarantine

What does this MR do?

What

Move the worker Security::ProcessScanResultPolicyWorker from database_throttled to quarantine

Why

Security::ProcessScanResultPolicyWorker was moved to database_throtted for performance issues in !3242 (merged), this was fixed in gitlab-org/gitlab!137707 (merged).

Moving this to quarantine will allow us to run more jobs and validate that we are not hammering the database.

Reference: gitlab-com/gl-infra/production#17168 (closed)

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