Use JWT token for CI_JOB_TOKEN

Alex Buijsrequested to merge
replace-ci-job-token-with-jwt-token into master

What does this MR do and why?

The CI_JOB_TOKEN, with which CI builds authenticate, currently contains a static encrypted token value. This MR replaces that static encrypted token with a dynamic JWT token, which we can use to encapsulate permissions and potentially other claims in the future.

Issue: https://gitlab.com/gitlab-org/govern/authorization/team-tasks/-/issues/65

Edited by Alex Buijs

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