Option to prevent form submission; display message if submission of form data to connector fails

Description

Currently, if the submission of form data to a marketing connector to create/update an entity is unsuccessful, it logs an error but still shows a success message in the UI. Also, the form submission is recorded in the Epi database.
Provide an option via the Admin settings to choose a different behavior, such that the error is displayed in the UI, and the form submission is not recorded in the database.