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 <hello@pngwn.io>
