[SDPAP-7052] add support for new back end response notes

[lambry]

Motivation and Context

JIRA issue: https://digital-vic.atlassian.net/browse/SDPAP-7052

Changed

1. Add support for new back end response notes; i.e. status and response message

As the back-end won't be returning a real status code we need to parse it out of a notes field, we could potential move this logic up out of the the vue component, so that postForm returns data and extra info like status instead of just the data. I'm not sure there's any "custom" work that relies on the current API though (https://github.com/dpc-sdp/ripple/blob/develop/packages/ripple-nuxt-tide/modules/webform/mixins/index.js#L11).

Screenshots

How Has This Been Tested?

REF: https://app.pr-1269.ripple.sdp4.sdp.vic.gov.au/esta-forms-testing

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist

• [ ] I've added relevant changes to the documentation.
• [ ] I have added tests to cover my changes (if not applicable, please state why)
• [ ] My change requires a template update for create-ripple-app.
• [ ] I have added template update script for next release.