feat: include visit registration questionary answers in visit messages

[janosbabik]

Adds visit registration questionary answers to visit message payloads using question natural keys.

New payload format:

{
  "id": "visit-registration-id",
  "startAt": "2026-08-24T08:00:00.000Z",
  "endAt": "2026-08-24T16:00:00.000Z",
  "visitorId": "123",
  "proposal": {...},
  "registrationAnswers": [
    {
      "questionNaturalKey": "request_daily_allowance",
      "value": true
    },
    ...
  ]
}

[jekabs-karklins]

Looks good - I left a commend on messagebroker WDYT.

[jekabs-karklins]

Suggested change

	registrationAnswers.push(
	...questionarySteps.flatMap((step) =>
	step.fields.map((field) => ({
	questionNaturalKey: field.question.naturalKey,
	value: field.value,
	}))
	)
	);
	registrationAnswers.push(
	...questionarySteps.flatMap((step) =>
	step.fields
	.filter((field) =>
	areDependenciesSatisfied(questionarySteps, field.question.id)
	)
	.map((field) => ({
	questionNaturalKey: field.question.naturalKey,
	value: field.value,
	}))
	)
	);

Can we add this check already, to make sure in case we introduce questions with dependencies the unanswered questions get filtered out?