feat(timeout): redirect to form start page and support new config fields

[SullyK]

• Fix timeout.html redirecting incorrectly to the /config route by using the injected referer instead.
  (See:

  digital-form-builder/runner/src/server/plugins/router.ts

  Lines 256 to 265 in 801bc7d

  	if (referer) {
  	const match = referer.match(/https?:\/\/[^/]+\/([^/]+).*/);
  	if (match && match.length > 1) {
  	startPage = `/${match[1]}`;
  	}
  	}
  	return h.view("timeout", {
  	startPage,
  	});

  ))

• Timeout now correctly redirects to the form's start page.

• Add support for new serviceName form field. This may overlap with existing name field... May be removed based on feedback.

• Use new fullStartPage form field instead of the global serviceStartPage setting. (Overrides config at

  digital-form-builder/runner/config/default.js

  Line 59 in 801bc7d

  serviceStartPage: "/ReportAnOutbreak/start",

  )

Example usage:

"fullStartPage": "/kls-path-1/contact-the-knowledge-and-library-services-team",
 "serviceName": "klsform",

Type of change

Please delete options that are not relevant.

• [ ✅] Bug fix (non-breaking change which fixes an issue)
• [✅ ] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested locally.

Checklist:

• [✅] I have performed a self-review of my own code