Introduce a maintainer access level on job artifacts

Related: #454398 (closed)

What does this MR do and why?

In GitLab 16.11, we introduced the concept of artifacts:access.

This MR introduces a new Maintainer+ level access restriction for Ci::JobArtifacts and Ci::Build on .gitlab-ci.yml artifacts: access level definition.

References

Screenshots or screen recordings

Before (developer user)	After (developer user)

How to set up and validate locally

1. Add a test project
2. Invite a developer user to the project
3. Invite a maintainer user to the project
4. Create a test .gitlab-ci.yml

rspec:
  script:
    - echo "<xml>" > rspec.xml
  artifacts:
    access: maintainer
    reports:
      junit: rspec.xml

In the pipeline, verify that artifacts are available to Maintainers and unavailable to Developers and Guests and all other non-developer roles.

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