Add Cell CI to CI_JOB_TOKEN JWT payload

Overview

In gitlab-com/content-sites/handbook!7775 (merged) we are moving CI_JOB_TOKEN to be JWT based. Part of phase 4 we are going to need CI_JOB_TOKEN to be JWT based, so that we can route it to the correct cell, to do this we need to add extra information to the CI_JOB_TOKEN JWT token payload:

• cell_id
• organization_id
• group_id
• project_id
• user_id