Closes #11360: Strip non-digit characters when calling getCreditCardIIN

[Amejia481]

Fixes #11360

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[pocmo]

Just a drive-by nit: We have been adding extension functions to support-ktx and everything else, that is more complex, to support-utils. At one point I was hopeful that all utilities in support-utils could be extension functions (and that component would disappear), but I am not sure if that will happen.