Remove `check_multiple_pipelines_for_security_reports` feature flag
After removing this feature flag, we will always check the most recent 10 pipelines to find one with security reports to use as the comparison base pipeline for the "MR security widget".
Changelog: other EE: true
Related to #428033 (closed), and #390024 (closed).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.