GraphQL PMG - job item

What does this MR do and why?

Resolves #467278 (closed)

Add job item to GraphQL version of the pipeline mini graph stage dropdown

View progress of this initiative in the Architecture Blueprint

Screenshots or screen recordings

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Prerequisites

• An enabled feature flag: Feature.enable(:ci_graphql_pipeline_mini_graph)
• A working runner

Steps

1. Navigate to a project (this example uses the flightjs group)
2. Navigate to the Pipeline Editor (Build > Pipeline editor)
3. Trigger a pipeline
4. Once the pipeline appears in the pipeline editor widget, click on a stage
5. You should see the dropdown with at least one job status and name

*Note: This MR is simply for the job item. Job actions will be added in the next issue.