ci: Start using external secret for ADD_JH_FILES_TOKEN
What does this MR do and why?
After the successful PoC that we made at !143201 (closed), we're ready to start using external secrets from GSM.
We start with a single token: ADD_JH_FILES_TOKEN for now.
The original attempt was reverted by !144038 (merged) since it broke dev.
Related to gitlab-org/quality/engineering-productivity/team#363, #440807 (closed).
Test matrix
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as-if-jhdon't run ondev
Edited by Rémy Coutable