[PLAY-1203] Default cancel and close button type to prevent submission

[thestephenmarshall]

What does this PR do?

When a form is used to wrap the Rails dialog kit block area content, any unspecified button element will submit the form. Only buttons specified with the type="submit" attribute should perform this function.

By defaulting the cancel and close (X) buttons in the Rails version of the kit, we can avoid this unintended side effect.

Screenshots: Screenshots to visualize your addition/change

• Please see the kits/dialog/rails#complex example

How to test? Steps to confirm the desired behavior:

1. Go to the aforementioned path on the review env
2. Activate the modal
3. Click either X or "Cancel"
4. The form should not submit (page should not reload and there should be no ? at the end of the URL in the browser's address bar)

Checklist:

• LABELS Add a label: enhancement, bug, improvement, new kit, deprecated, or breaking. See Changelog & Labels for details.
• DEPLOY I have added the milano label to show I'm ready for a review.
• TESTS I have added test coverage to my code.

[github-actions]

🎉 Congratulations on creating an Alpha Version!

Your Alpha for Ruby Gems is 13.21.0.pre.alpha.PLAY120322465

Your Alpha for NPM is 13.21.0-alpha.PLAY120322465