fix(ModalWrapper): fix submit and close logic, add story w/ args, update tests to RTL

[jnm2377]

Closes #11713

Changelog

While I was working on refactoring the tests to RTL, I added a story to check everything, then I realized some of the functionalities were actually not working. Specifically closing (on secondary click and close button click) and close on submit. It would, however, close on esc.

• updates tests to RTL
• one snapshot automatically deleted when tests were updated
• adds story
• fix this.modal.current.innerModal.current was returning undefined (probably bc Modal is now a wrapper)
• fix handleSubmit to actually close on submit if the prop is true

Testing / Reviewing

• test against website to view bug: https://carbondesignsystem.com/components/modal/code/
• test story and check that:
  • modal opens correctly on click
  • modal opens correctly on button enter
  • modal closes on esc press
  • modal closes on Cancel or close button click
  • modal closes on Cancel or close button enter
  • modal closes on submit click
  • modal closes on submit enter
  • modal does not close on inner modal click
  • modal closes on outer modal click
• check that all tests are passing and make sense

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