* Import Currency type from correct location
* Add type for productPriceValidation argument
* Default tabIndex to undefined
null is not an acceptable value for the tabIndex prop, but undefined is, so we should use that.
* Explicitly set type of CartLineItemRow to ForwardRefExoticComponent
* bot: update checkstyle.xml
* Change CartLineItemRow to extend React.RefAttributes
* bot: update checkstyle.xml
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