PROCTools: warn when updating existing references
Add a warning to update_ci_reference_files.py in case the user tries to overwrite existing references as happened on ATLASRECTS-7944.
cc @atlas-release-coordinators
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Add a warning to update_ci_reference_files.py in case the user tries to overwrite existing references as happened on ATLASRECTS-7944.
cc @atlas-release-coordinators