Feature/1204 Mandate NINo field in Personal details section of Application form

[HalcyonJAC]

What's included?

Closes #1204

Who should test?

✅ Product owner
✅ Developers
✅ UTG

How to test?

Example vacancy

Steps:

1. Apply for the vacancy.
2. Go to the Personal details section.
3. Check if the field "National Insurance number" is mandatory.

Risk - how likely is this to impact other areas?

🟢 No risk - this is a self-contained piece of work

Additional context

Include screen grabs, notes etc.

---

PREVIEW:DEVELOP
can be OFF, DEVELOP or STAGING

[github-actions]

Visit the preview URL for this PR (updated for commit 6d8f9bd):

https://jac-apply-develop--pr1205-feature-1204-mandate-ypbfz6y4.web.app

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[nickaddy]

@HalcyonJAC The Save and continue button is greyed out for me irrespective of whether or not the NINo field is populated.

[HalcyonJAC]

@nickaddy It might be that you have submitted the application. I have moved your application to draft for this exercise. Could you test it again, please?

[nickaddy]

That works, @HalcyonJAC, thank you :-)

[Franceswog]

NI field is mandatory, no issues to report.