Allow CI_JOB_TOKEN in artifact download API

Description

If a pipeline depends on the artifacts of another pipeline, the job should be able to request those artifacts using the CI_JOB_TOKEN for permissions.

Proposal

Links / references

Documentation blurb

With the introduction of dependencies between different projects, one of them may need to access artifacts created by a previous one. This process must be granted for authorized accesses, and it can be done using the CI_JOB_TOKEN variable that identifies a specific job.