Show message when design management is not enabled

What does this MR do and why?

This message was identified as missing when updating feature specs to run against the new work item issues

Changelog: fixed

References

• &17987
• #555803

Screenshots or screen recordings

Legacy issues	Work item issues (this MR)

How to set up and validate locally

1. Update your local gitlab instance not to have LFS OR stub hasDesignManagementFeature to true
2. Go to an issue and confirm the message is there

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.