Description of the problem:
When choosing anything in the "Send certificate via" dropdown in the "dynamic course select" workflow, the workflow fails to execute with the following error:

HTTP POST request to http://dynamic-course-select.sonataflow-infra/dynamic-course-select failed.
Status Code: 400
Status Text: Bad Request
Message: There are JsonSchema validation errors:
$.sendCertificatesAs: string found, object expected 

According to dev:
It's a bug in the workflow, there should be string type here: https://github.com/rhdhorchestrator/orchestrator-demo/blob/main/06_form-widget-dem[…]xampleWorkflows/schemas/dynamic-course-select__main-schema.json
Since the HTTP server handles that as a string:
https://github.com/rhdhorchestrator/orchestrator-demo/blob/main/06_form-widget-demo/http-workflow-dev-server/httpServer.dynamic.course.select.js#L165

How reproducible: 100%

Steps to reproduce:

1. Deploy operator  1.6.0-rc7 with rc11 plugins

2. Deploy dynamic course select workflow

3. Choose anything in the "Send certificate via" dropdown, and click Run.

Actual results: See above

Expected results: Workflow should run normally.