ci: Use id_tokens instead of CI_JOB_JWT envvar

iid_tokens will replace $CI_JOB_TOKEN predefined variable in GitLab 18.0
See:
https://docs.gitlab.com/ee/update/deprecations.html#default-cicd-job-token-ci_job_token-scope-changed

This is a port of mesa/mesa!28916

 in Mesa

Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com>