Change CardInputWidget icon to represent validity of input #2224
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Summary
After validating
CardInputWidget
input (i.e. when a params object isattempted to be created), if validation fails, show an error icon for
the brand icon.
Motivation
Previously, error state was only visually indicated by changing the text color of the fields. For some users, it is difficult or impossible to distinguish solely on color.
Fixes #2200
Testing
Unit test
Manual validation