Extend pipeline job page for Deployment Approvals

What does this MR do and why?

Part of Deployment Approvals MVC: #343864 (closed)

Screenshots or screen recordings

Job page:

How to set up and validate locally

1. Enable the deployment_approvals feature flag.

Feature.enable(:deployment_approvals)

2. Set up a project to deploy to an environment. Example job from .gitlab-ci.yml:

production:
  stage: deploy
  script:
    - echo done
  environment:
    name: production

3. Protect the environment being deployed to. See https://docs.gitlab.com/ee/ci/environments/protected_environments.html#protecting-environments.

4. Add some required approvals to the protected environment that was just created:

ProtectedEnvironment.last.update(required_approval_count: 1)

5. Start a pipeline. The production job page should indicate that it is waiting for approval.

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.