fix(OrderSummary): Add aria-labelledby, missing attributes fail A11Y tests (#514)
fix(OrderSummary): Add aria-labelledby, missing attributes fail A11Y tests (#514)

* fix(OrderSummary): Add aria-labelledby, missing attributes fail A11Y tests, resolves #513

* fix(OrderSummary): make id random to avoid duplication, resolves #513

* fix(OrderSummary): default props are static, put them as default values

joshblack/carbon-components-react,carbon-design-system/carbon-components,carbon-design-system/carbon-components,carbon-design-system/carbon-components,jzhang300/carbon-components-react,joshblack/carbon-components-react,carbon-design-system/carbon-components-react,carbon-design-system/carbon-components-react