fix(create-form.js): fix onSubmit rejection being ignored when using validationSchema

[dlebech]

This commit fixes an issue that occurs when using yup validation schema and an onSubmit function that rejects.

In this case, the rejection is completely ignored, because because handleSubmit has a .catch() function that assumes the error is from yup.

The fix is to change the catch to a then and use both the onFulfilled and onRejected handlers, depending on whether validation failed or not.

[dlebech]

It looks like the build partially failed for the node version which I assume is the latest. The test suite looks ok.