CTW testlibrary shouldn't ignore errors raised by the library itself

currently, CTW testlibrary ignores all errors raised during compilations as there can be exception related to missed classes, files, or other errors from <clinit> or class loading errors and we don't want ctw-test to fail in case of such errors, however we must fail the test if the library caused an error (e.g. as in JDK-8214915).