Add operational report message to vulnerability report

What does this MR do and why?

This MR adds a message card to the operational vulnerabilities report tab. Only the message is added from the design, we will be handling the Export button as a separate issue. Please note that if !74498 (merged) is not merged, then the message will only show on the group and instance-level reports. After it is merged, the message will show on the project-level report as well.

Design	Before	After

Describe in detail what your merge request does and why.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #338790 (closed)