fix(form-group): remove default hasMargin prop

[joshblack]

This PR removes the hasMargin prop from defaultProps in FormGroup. This prop used to be available in v10 but is no longer used as part of the className in v11

Changelog

New

Changed

Removed

• Remove the defaultProp value for hasMargin

[amtoussam]

@joshblack Should the story also get updated?

https://github.com/carbon-design-system/carbon/blob/main/packages/react/src/components/FormGroup/FormGroup-story.js#L21

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[joshblack]

@amtoussam it should be good to go since that is the old v10 story, let me know if I'm misunderstanding though!

[joshblack]

bump @dakahn when you get a sec