Remove the Projects::PipelinesController#config_variables endpoint
What does this MR do and why?
This MR resolves the last item listed in: Backend: Deprecate "sha" parameter from CI conf... (#389065 - closed)
This MR removes the Projects::PipelinesController#config_variables
endpoint and related references. This endpoint is not in use according to logs; it was decided that a deprecation process is not necessary in this case.
MR acceptance checklist
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Related to #389065 (closed)
Edited by Leaminn Ma