Unhandled promise rejections during build cause hangs instead of proper error exits

Unhandled promise rejections during build cause hangs instead of proper error exits: a task in LegoFlow-SWE (Harbor dataset). Observed behavior When a build encounters an error (e.g., app.import referencing a missing file) in recent versions of ember-cli (≥ 3.15, or with EMBER CLI BROCCOLI…