Log exit code and signal if npm errors

part of FlowFuse/flowfuse#3630

This is a first itteration to record the exit codes.

Still needs more customer friendly message

lib/launcher.js

@@ -237,7 +237,7 @@ class Launcher {
                     if (code === 0) {
                         resolve()
                     } else {
-                        reject(new Error('Failed to install project dependencies'))
+                        reject(new Error(`Failed to install project dependencies ret code: ${code} signal ${child.signalCode}`))
                     }
                 })
             }).catch(err => {