Draft: Add job navigation to trigger job show page

What does this MR do and why?

For #345046

This adds the jobs container and stages dropdown to the trigger job show page. Since the trigger job app is separate from the regular job app, some tweaking of the CSS had to be done to make the styling consistent.

Screenshots or screen recordings

Before (Trigger Job)	After (Trigger Job)

There are no visual changes to the regular job page.

Before (Job)	After (Job)

Recording of the stage navigation:

Job Navigation

Job Navigation

How to set up and validate locally

1. Enable the ci_retry_downstream_pipeline feature flag. (rails c then Feature.enable(:ci_retry_downstream_pipeline))
2. Add the following content to your .gitlab-ci.yml file:

   stages:
     - prepare
     - deploy
   
   job:
     stage: prepare
     script:
       - echo "running prepare_job"
   
   triggerJob:
     stage: deploy
     trigger:
       include:
         - project: "/path/to/project" # replace with another project
           file: ".gitlab-ci.yml"

3. Visit the pipeline and click on the triggerJob job pill.
4. Site should redirect to the trigger show page.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.