Remove JVM-specific way of reading test resources (#366)

Part of #269.

It's not used anywhere, after migrating tests that use resources to
common Kotlin.

src/jvmTest/java/org/snakeyaml/engine/v2/utils/TestUtils.java

@@ -26,20 +26,6 @@
 
 public abstract class TestUtils {
 
-  public static String getResource(@Language("file-reference") String theName) {
-    InputStream inputStream = getResourceAsStream(theName);
-    return new BufferedReader(new InputStreamReader(inputStream)).lines()
-        .collect(Collectors.joining("\n", "", "\n"));
-  }
-
-  public static InputStream getResourceAsStream(@Language("file-reference") String theName) {
-    InputStream inputStream = TestUtils.class.getResourceAsStream(theName);
-    if (inputStream == null) {
-      throw new RuntimeException("Resource not found: " + theName);
-    }
-    return inputStream;
-  }
-
   public static void compareEvents(List<Event> list1, List<Event> list2) {
     assertEquals(list1.size(), list2.size());
     for (Event event1 : list1) {