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Feature Request: Add npmExecuteTests step for running npm tests

Feature Request: Add npmExecuteTests step for running npm tests: a task in LegoFlow-SWE (Harbor dataset). We need a new pipeline step npmExecuteTests that can execute npm test scripts for one or more target URLs, optionally with credentials passed via environment variables.

The task

We need a new pipeline step `npmExecuteTests` that can execute npm test scripts for one or more target URLs, optionally with credentials passed via environment variables.

Part of Lego-X/LegoFlow-SWE.