[UTILS] Add api error handler

[mdanilowicz]

Add a util function that will handle API errors management

if (error instanceof ApiClientError) {
      const errors = resolveApiErrors(error.details.errors);
      for (const error of errors) {
        pushError(error);
      }
    }

Acceptance Criteria

• [ ] Util is added to the vue-demo-template
• [ ] Util is added to the vue-starter-template