Draft: Add basic security training promo popover to MR widget

What does this MR do and why?

This MR adds a basic security training promo popover to MR widget, UI only. This is part of a series and more functionality will be introduced. Please see this issue for the detailed breakdown > #346064 (closed).

Screenshots or screen recordings

NOTE: the screenshot is subject to change, it is currently WIP ⚠ It will closely resemble the mock as I continue this MR 👍

How to set up and validate locally

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

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 #346064 (closed)