Updates security issues section
Why is this change being made?
Updates "Security issues" section on Engineering Workflow, per gitlab-com/gl-infra&121 (comment 268184595).
- Removes outdated information
- References to the security documentation to avoid duplicating information
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what