[Feat]: Add customizability to form invalid notification

[jnewman-eti]

Is your feature request related to a problem? Please describe.
When a user fills out a form with invalid input and submits the form, a notification appears, "The Form Is Not Valid" This message cannot be customized.

Describe the solution you'd like
Give the developer more control over form validation to allow the developer to intelligently set a custom validation message for this notification.