2777 Add restProps to IconButton … (#2791)

* 2777 Add restProps to IconButton and use it to pass aria-labels down to the button element where it's used in other UI components

* 2777 Update per PR feedback, explicitly pass in label prop instead of using restProps

* 2777 Fix mysterious linter error

* Update changelog to fix PR number 2791

* Fix merge conflict

* Update CHANGELOG.md

Co-authored-by: pngwn <[email protected]>

Author: emilyuhde