feat(ui-react-native): Add theming for IconButton primitive

[joebuono]

Description of changes

• Removed unused text property from styles
• Updated unit tests to use @testing-library/react-native

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Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are updated

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[calebpollman]

Thinking we should probably also provide a container button prop so users can apply the theme to the Pressable when its not pressed

[ioanabrooks]

+1 Also disabled and size.

[calebpollman]

LGTM. Just to confirm, did we check if it impacts usage in the InApp Messaging components?

[joebuono]

LGTM. Just to confirm, did we check if it impacts usage in the InApp Messaging components?

Just checked and it doesn't appear to impact InApp Messaging