FlowEditor: Skipping Validation for wait for result

[AkhileshNegi]

Is your feature request related to a problem? Please describe.
In flow editor, we can validate variables like @contact.name and @results.response to catch obvious errors. But if the flow uses wait for result, those variables come from outside the editor and can’t be validated there. In that case, we should skip the check.

Describe the solution you'd like
Skip flow variable validation if the flow has wait for result