Add related topics link

What does this MR do and why?

• Uses a related topics link for Create a Jira issue for a vulnerability instead of having a one-sentence topic. See Pages and topics to avoid.
• Updates the jira_for_vulnerabilities feature flag.

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.