fix(3280): submitForm should reject on validation fail

[SpLouk]

Fixes #3280

Formik docs says this about submitForm:

Trigger a form submission. The promise will be rejected if form is invalid.

If the validate callback returns an object, rather than rejecting, this is still a validation failure (object is error data). The promise returned by submitForm should reject.

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Name	Status	Preview	Comments	Updated (UTC)
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