The submit button of the checkout block remains disabled after a failed payment

[RadoslavGeorgiev]

Describe the bug

The bug is already described in the description of this PR (the "Erroneous state after confirmation" section).

To reproduce

Steps to reproduce the behavior:

1. Checkout & setup WooCommerce Payments in test mode.
2. Use the checkout block and an SCA-enabled test card (ex. 4000002500003155)
3. In the payment authentication (SCA) modal, decline the payment.
4. Check the submit button. It will be disabled and contain a check mark.

Expected behavior

The submit button should go back to it's original and usable state.

Screenshots

cc @nerrad as you confirmed the issue here:

"Even though the confirmation failed, the submit button displays a seemingly successful check-mark." Ya this looks buggy, and I'll need to investigate.

[nerrad]

I think this is also related to #2743, hence adding to our current sprint pipeline because I want to focus on getting these type of bugs fix (ideally for next release of the blocks).