[FE] Add "Reachable" To Vulnerability Details

Add "Reachable" to the Vulnerability Details page.

Design: Design: End-user Static Reachability UX/UI (#480356 - closed)

Implementation Plan

See MR for reference: Draft: Add reachability to vulnerability detail... (!178450 - closed)

Scope

"Reachable" needs to be made available in all 3 pages:

• https://docs.gitlab.com/ee/api/graphql/reference/#queryvulnerabilities
• https://docs.gitlab.com/ee/api/graphql/reference/#groupvulnerabilities
• https://docs.gitlab.com/ee/api/graphql/reference/#projectvulnerabilities

Query.vulnerabilities
Project.vulnerabilities
Group.vulnerabilities

backend [BE] Add Reachability status to GraphQL for Vul... (#513991 - closed)