Create configuration security training providers UI

What does this MR do and why?

In this MR, we add the UI for the display of the training provider cards.

This MR is part of the new security training feature, please see the epic for details and the implementation breakdown > &6176 (closed)

Note: the data currently is hardcoded, but will be replaced with a GraphQL query in this follow-up issue

Screenshots or screen recordings

How to set up and validate locally

This feature is behind a feature flag, to enable

rails c

Feature.enable(:secure_vulnerability_training)

1. Navigate to Security & Compliance > Configuration
2. Click on the "Vulnerability Management" tab
3. You will see the training provider cards

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 #346057 (closed)