fix: prevent Shadow 9 from relocating logback descriptor in ClassicSdk appender suppression

The upgrade from Shadow 8 to Shadow 9 (via gradle-plugins 2.26.1-alpha)
changed constant pool string scanning to be more aggressive. Shadow 9 now
rewrites all UTF-8 string constants containing relocatable package names,
not just class/type references. This caused the literal
"(Lch/qos/logback/classic/spi/ILoggingEvent;)V" inside
ApplicationInsightsAppenderClassVisitor to be relocated to a shadowed
package path, so the descriptor check in visitMethod() never matched the
actual user class. This left the Classic SDK logback appender running
unsuppressed, producing duplicate MessageData (SourceType "LOGBack"
alongside "Logger").

Replace the exact descriptor equality checks with a generic signature
pattern match on the append method. This is safe because transform()
already gates on the exact appender class name via UnshadedSdkPackageName.

Author: xiang17

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/classicsdk/ApplicationInsightsAppenderClassFileTransformer.java

@@ -72,10 +72,12 @@ public MethodVisitor visitMethod(
         @Nullable String signature,
         @Nullable String[] exceptions) {
       MethodVisitor mv = cw.visitMethod(access, name, descriptor, signature, exceptions);
+      // match append(SomeLoggingEvent): the descriptor type-strings are not checked here
+      // because Shadow relocates the "ch/qos/logback" literal, breaking the match at runtime;
+      // class-name filtering in transform() already guarantees we are in the right class
       if (name.equals("append")
-          && (descriptor.equals("(Lch/qos/logback/classic/spi/ILoggingEvent;)V")
-              || descriptor.equals("(Lorg/apache/log4j/spi/LoggingEvent;)V")
-              || descriptor.equals("(Lorg/apache/logging/log4j/core/LogEvent;)V"))) {
+          && descriptor.startsWith("(L")
+          && descriptor.endsWith(";)V")) {
         // no-op the append() method
         mv.visitCode();
         mv.visitInsn(RETURN);