fix(measurements): persist new survey questions

[mohiuddinshahrukh]

What changed

Fixes the measurements survey editor so newly created questions are saved correctly and duplicated questions no longer fail.

Why

Creating a question in a brand-new measurement could appear to succeed, but the question would not remain visible because the route stayed on /measurements/new and reopened a fresh staged survey after save. Duplicating a fresh question could also fail because responseOptionsValidity was read before it had been initialized.

User impact

Users can now:

• save a question in a newly created measurement survey and see it remain in the list
• duplicate a newly created question without triggering a runtime error
• continue editing on the saved measurement route instead of being reset to an empty staged survey

Root cause

There were two issues in the measurements flow:

• question form duplication assumed responseOptionsValidity had always been initialized
• question changes in measurement surveys needed to propagate up to the parent survey save, and new measurements needed to redirect from the temporary new route to the real measurement id after the first save

Validation

• reproduced the failing create-and-duplicate flow from the measurements page
• fixed the runtime crash in question duplication
• wired question save propagation for measurement surveys
• redirected newly saved measurements to their persisted route
• did not run automated tests