The type property on error objects was set to this.constructor.name, which gets mutated during minification. To fix this, explicitly set the type to a hardcoded string for known subclasses of StripeError. This also keeps the default behavior the same in the StripeError parent class for backwards compatibility.

I've added a test project to verify error.type does not get minified when bundling / minifying with esbuild.

Fixes #2042