Add a drawer to the compliance report

Problem to solve

Specific highlights from a Merge Request are useful for knowing what to do next when evaluating a Merge Request violations, but they can create noise when sharing the same space on the report.

Proposal

Add a drawer that users can open and close to find information they might need without having to leave the compliance report page.

Open Questions / Notes for Refinement

1. Do any of the individual components in the drawer need to be broken out into separate issues?

Implementation

frontend estimated weight 2️⃣

1. On clicking a merge request row, show a GlDrawer.
2. Load in the available data for the MR title, project name, MR ID, authors and approvals from an upper level component or store.
   • Use GlAvatarsInline component to display the users
   • Use GlAvatarLabeled for the project name and avatar
3. Add unit tests and feature specs