Merge branch '3630-use-external-secrets-1' into 'master'

ci: Start using external secret for ADD_JH_FILES_TOKEN

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143682



Merged-by: Lin Jen-Shin <jen-shin@gitlab.com>
Approved-by: Lin Jen-Shin <jen-shin@gitlab.com>
Reviewed-by: Lin Jen-Shin <jen-shin@gitlab.com>
Reviewed-by: David Dieulivol <ddieulivol@gitlab.com>
Co-authored-by: Rémy Coutable <remy@rymai.me>