[TESTBUG] appcds TestCommon.makeCommandLineForAppCDS() can be removed

With the UseAppCDS flag being obsoleted in JDK 11, the following method in appcds TestCommon becomes a nop. The method and usage in various appcds tests can be cleaned up.

    public static String[] makeCommandLineForAppCDS(String... args) throws Exception {
        return args;
    }