chore: Use Protobuf Message instead of GeneratedMessageV3 (#2800)

Author: lqiu96

google-cloud-storage/src/test/java/com/google/cloud/storage/GenerateGrpcProtobufReflectConfig.java

@@ -17,7 +17,7 @@
 package com.google.cloud.storage;
 
 import com.google.protobuf.AbstractMessage;
-import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.Message;
 import com.google.protobuf.ProtocolMessageEnum;
 import io.github.classgraph.ClassGraph;
 import io.github.classgraph.ClassInfo;
@@ -55,7 +55,7 @@ public static void main(String[] args) throws IOException {
                           + "    \"methods\":[{\"name\":\"<init>\",\"parameterTypes\":[] }]\n"
                           + "  }"),
                   Stream.of(
-                          scanResult.getSubclasses(GeneratedMessageV3.class).stream(),
+                          scanResult.getSubclasses(Message.class).stream(),
                           scanResult.getSubclasses(AbstractMessage.Builder.class).stream(),
                           scanResult.getAllEnums()
                               .filter(ci -> ci.implementsInterface(ProtocolMessageEnum.class))

google-cloud-storage/src/test/resources/META-INF/native-image/com/google/cloud/storage/reflect-config.json

@@ -15,7 +15,7 @@
     "allDeclaredMethods":true,
     "methods":[{"name":"<init>","parameterTypes":[] }]
   },
-  { "name": "com.google.protobuf.GeneratedMessageV3$Builder", "queryAllDeclaredConstructors": true, "queryAllPublicConstructors": true, "queryAllDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "allPublicClasses": true },
+  { "name": "com.google.protobuf.Message$Builder", "queryAllDeclaredConstructors": true, "queryAllPublicConstructors": true, "queryAllDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "allPublicClasses": true },
   { "name": "io.grpc.alts.internal.AltsContext", "queryAllDeclaredConstructors": true, "queryAllPublicConstructors": true, "queryAllDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "allPublicClasses": true },
   { "name": "io.grpc.alts.internal.AltsContext$Builder", "queryAllDeclaredConstructors": true, "queryAllPublicConstructors": true, "queryAllDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "allPublicClasses": true },
   { "name": "io.grpc.alts.internal.Endpoint", "queryAllDeclaredConstructors": true, "queryAllPublicConstructors": true, "queryAllDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "allPublicClasses": true },