VUU-333: Fix Application Layouts Data Contract

[pling-scottlogic]

Description

Fixes the data contract for the application-layouts resource on the layout server. Also introduces end-to-end Cypress tests to ensure the data contract holds.

Change List

• Backend:
  • Replace ApplicationLayoutDto with ObjectNode to allow for arbitrary JSON structure
  • Rename "definition" fields to match the frontend model
  • Synchronise default application layout JSON with local equivalent
  • Adjust server tests to reflect changes
• Frontend:
  • Replace GetApplicationResponseDto with ApplicationJSON
  • Add Cypress tests to ensure API contract does not get violated
  • Add api.utils.ts to abstract API calls for testing
  • Rename field on ApplicationJSON interface
• CI/CD
  • Add script to run layout server
  • Run layout server script as part of Cypress setup

Testing

Changes manually tested using the remote implementation from both showcase and sample app.

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