Fs 2368 add another data

[adamdavies1]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
Please also include any acceptance criteria if you have any.
JIRA: https://digital.dclg.gov.uk/jira/browse/FS-2368

• Changed the answers for the MultiInputComponent to be a json format. Example of the new data is bellow

{
  "name": "Digital Form Builder - Runner add-another",
  "questions": [
    {
      "question": "First page",
      "fields": [
        {
          "key": "MultiInputField",
          "title": "MultiInputField",
          "type": "multiInput",
          "answer": [
            {
              "type-of-revenue-cost": "Town Funding",
              "value": "100000"
            },
            {
              "type-of-revenue-cost": "City",
              "value": "4545"
            }
          ]
        }
      ]
    }
  ],
  "metadata": {
    "application_id": "efg-1256",
    "isSummaryPageSubmit": true,
    "form_session_identifier": "efg-1256",
    "paymentSkipped": false
  }
}

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce
the testing if necessary.

Before PR's can be merged they will need to be tested by QA and approved where
applicable. To flag the change to QA assign @XGovFormBuilder/qa as one of the reviewers.

• Go the the add-another form
• Add a new inputs
• See if the summary page is still displaying the correct data
• Check to see if the form data submitted on save per page is in the correct format

Checklist:

• My changes do not introduce any new linting errors
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation and versioning
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have rebased onto main and there are no code conflicts
• I have checked deployments are working in all environments

[tferns]

Was this changed on purpose to a string? Is the "True" just for a truthy evaluation?

[adamdavies1]

This is a basically a revert, something was push by mistake in another pr