Align designs displaying activites with available solutions

Problem to solve

In #36500 (closed) (implementation: #215684 (closed)) will display when auto-created merge request are created (opt-in by default) or when solutions are available (opt-out of auto-fix).

The design may be out-of-date per changes on the vulnerability list. https://gitlab.com/gitlab-org/gitlab/uploads/a04ea59d88df8a7da1fad3f81e5260ef/c.png

Solution ideation

Revisions (see designs):

• Adds filter capability by:
  • Addition of With Merge Request and With auto-fix solution items in activity filter (follow up add to: #230381 (closed))
• Lightbulb icon displays in the activities column when auto-created MR exists and/or suggested solution
• Showing the MR is a post-MVC

Implementation plan

backend backend-weight3

1. Iteration 1
   • Add available auto-fix solutions and associated merge requests to Vulnerability type in GraphQL.
2. Iteration 2
   • Add a field for Merge Request to identify if it's created with auto-fix bot.

frontend

1. Iteration 1
   • Extend the client-side GraphQL fragment to include available solutions and open Merge Requests (including the distinction between manual MRs and autofix ones).
   • Based on the fetched data, display the lightbulb icon in the Activity column when a vulnerability has available solutions.
2. Iteration 2
   • Add ability to filter by "With Auto-fix solution".
3. Iteration 3
   • Add the MR popover.
   • Add the ability to filter by "With Merge Request".

documentation frontend-weight1

1. Add information to https://docs.gitlab.com/ee/user/application_security/security_dashboard/#vulnerability-report about the new filtering capabilities.

View designs in Figma