Fix custom check tests on Java 25 (#14873)

Author: trask

custom-checks/build.gradle.kts

@@ -13,8 +13,6 @@ dependencies {
 
 otelJava {
   minJavaVersionSupported.set(JavaVersion.VERSION_17)
-  // OtelInternalJavadocTest fails with 25-ea
-  maxJavaVersionForTests.set(JavaVersion.VERSION_24)
 }
 
 // We cannot use "--release" javac option here because that will forbid exporting com.sun.tools package.

custom-checks/src/main/java/io/opentelemetry/javaagent/customchecks/OtelInternalJavadoc.java

@@ -83,6 +83,6 @@ private static String getJavadoc(VisitorState state) {
     if (docCommentTree == null) {
       return null;
     }
-    return docCommentTree.toString().replace("\n", "");
+    return docCommentTree.toString().replace("\n", " ").replace(" * ", " ").replaceAll("\\s+", " ");
   }
 }