Fix DUO_WORKFLOW_EXECUTOR_VERSION read path
What does this MR do and why?
Reads the file DUO_WORKFLOW_EXECUTOR_VERSION relative to Rails.root to fix the error (introduced in !165429 (merged)) that occurs when puma runs in an omnibus-gitlab environment (see gitlab-org/quality/engineering-productivity/master-broken-incidents#8341 (comment 2097248417))
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Edited by Mark Lapierre