Optimize Lambda proxy class matching on filtering

When trying to match classes to exclude third-party ones we are
excluding also lambda proxy classes that are shown with JVM option
-XX:+ShowHiddenFrames
RegEx are used to identify them correctly but this is expensive.
we are using a fast path by searching for 'Lambda' first before
applying RegEx matching.

Author: jpbempel

dd-java-agent/agent-debugger/src/main/java/com/datadog/debugger/util/ClassNameFiltering.java

@@ -50,7 +50,7 @@ public boolean isExcluded(String className) {
   }
 
   static boolean isLambdaProxyClass(String className) {
-    return LAMBDA_PROXY_CLASS_PATTERN.matcher(className).matches();
+    return className.contains("Lambda") && LAMBDA_PROXY_CLASS_PATTERN.matcher(className).matches();
   }
 
   int shadedIndexOf(String className) {