#3074 Incorporate ModelConverters.skippedClasses before adding method return type to schema

[arinal]

Issue is #3074

Previously, executing

ModelConverters.getInstance().addClassToSkip("io.app.ClassToSkip");

would still include io.app.ClassToSkip class into the output components schema if the class is returned by some actions, e.g.

class Api {
   @GET
   ClassToSkip action();
}

This PR incorporates registered skipped classes in ModelConverters inside Reader's filtering logic.

[frantuma]

Thanks for this! included and replaced by #3107