fix: Close Dialog without submit

[alimpens]

Describe the pull request

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What

This changes the Dialog close button from type="submit" to type="button", and uses JS to close the Dialog.

Why

We received an issue noting that using the Dialog close button triggers a submit event, which it shouldn't.

How

By changing the Dialog close button from type="submit" to type="button", and using and exporting a JS function to close the nearest modal.

Checklist

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• Add or update unit tests
• Add or update documentation
• Add or update stories
• Add or update exports in index.* files
• Start the PR title with a Conventional Commit prefix, as explained here.

Additional notes

• JSDom doesn't fully support dialog, so this functionality isn't tested.