Group-level compliance dashboard MVC frontend

Frontend component of group-level compliance dashboard

This MR is adds to and updates the frontend of the group-level compliance dashboard as described in #36524 (closed).

This MR branches off from the backend MR !20844 (merged).

Screenshots

New dashboard:

Empty state (when no MRs have been merged in a group):

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required) !23172 (merged)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team

/ cc @mksionek

Closes #36524 (closed)