Show relevant values in job name for matrix builds

Problem to Solve

In !33705 (merged) we are exposing job names as name index/total, but this is not sufficient for someone who is looking at the pipeline jobs to understand what is being worked on there. We should add more context to this name, including variable names. Currently we show:

jobname: 1/2
jobname: 2/2

Intended users

• Devon (DevOps Engineer)

User experience goal

This addresses an important UX gap

Proposal

The name with variables is already computed at: lib/gitlab/ci/config/normalizer/matrix_strategy.rb We should change it to replace the name value at https://gitlab.com/gitlab-org/gitlab/-/blob/b600de609ac964e1e56259c8cd7f605aabbef243/lib/gitlab/ci/config/normalizer/matrix_strategy.rb#L58

In the job name we should show all the the values for all the jobs in the matrix. I.e.:

deploystacks:
  stage: deploy
  script:
    - bin/deploy
  parallel:
    matrix:
      - PROVIDER: aws
        STACK:
         - monitoring
         - app1
         - app2
      - PROVIDER: ovh
        STACK: [monitoring, backup, app]
      - PROVIDER: [gcp, vultr]
        STACK: [data, processing]

The above would generate the following parallel jobs each having different values for PROVIDER and STACK:

deploystacks: ovh, monitoring
deploystacks: ovh, backup
deploystacks: ovh, app
deploystacks: gcp, data
deploystacks: gcp, processing
deploystacks: vultr, data
deploystacks: vultr, processing

If there are very many configuration items or very long values this could extend off the visible area. These should be truncated, with a longer version shown on hover.

Further details

Permissions and Security

Documentation

Availability & Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Is this a cross-stage feature?

Links / references