Allow blocking security issues to be added late to the tracking issue

Reuben Pereirarequested to merge
rp/ignore-blocking-issues into master

What does this MR do?

In gitlab-com/gl-infra/delivery#1250 (closed), point 4 mentions that Perhaps we need to exclude issues marked as blockers? It may be possible an issue is marked as blocked after the deadline, but we don't want the bot to then immediately unlink the issue.

This MR modifies the IssueLinksValidator to allow security issues that block the tracking issue to be added beyond the cutoff time.

Author Check-list

  • Has documentation been updated?

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