Drop stale ddprof ThreadContext/BufferWriter* native-image references (#12100)

Drop stale ddprof ThreadContext/BufferWriter* native-image references

java-profiler's Phase 3 DBB-context removal (DataDog/java-profiler#696) deletes
ThreadContext, BufferWriter, BufferWriter8, and BufferWriter9. The GraalVM
native-image class-initialization config and reflection config here still
name them; a native-image build against the next ddprof release fails
resolving those classes. Drop the now-nonexistent entries ahead of the bump.

Co-authored-by: devflow.devflow-routing-intake <devflow.devflow-routing-intake@kubernetes.us1.ddbuild.io>

Author: rkennke

dd-java-agent/agent-bootstrap/src/main/resources/META-INF/native-image/com.datadoghq/dd-java-agent/reflect-config.json

@@ -206,17 +206,5 @@
     "fields": [
       {"name": "consumerIndex", "allowUnsafeAccess": true}
     ]
-  },
-  {
-    "name": "com.datadoghq.profiler.BufferWriter8",
-    "methods": [
-      {"name": "<init>", "parameterTypes": []}
-    ]
-  },
-  {
-    "name": "com.datadoghq.profiler.BufferWriter9",
-    "methods": [
-      {"name": "<init>", "parameterTypes": []}
-    ]
   }
 ]

dd-java-agent/instrumentation/graal/graal-native-image-20.0/src/main/java/datadog/trace/instrumentation/graal/nativeimage/NativeImageGeneratorRunnerInstrumentation.java

@@ -65,10 +65,6 @@ public static void onEnter(@Advice.Argument(value = 0, readOnly = false) String[
               + "com.datadog.profiling.controller.openjdk.events.QueueTimeEvent:build_time,"
               + "com.datadog.profiling.controller.openjdk.events.TimelineEvent:build_time,"
               + "com.datadog.profiling.controller.openjdk.events.SmapEntryEvent:build_time,"
-              + "com.datadoghq.profiler.ThreadContext:run_time,"
-              + "com.datadoghq.profiler.BufferWriter:run_time,"
-              + "com.datadoghq.profiler.BufferWriter8:run_time,"
-              + "com.datadoghq.profiler.BufferWriter9:run_time,"
               + "datadog.context.ContextKey:build_time,"
               + "datadog.context.ContextProviders$ProvidedManager:build_time,"
               + "datadog.environment.JavaVirtualMachine:rerun,"