chore: remove trivial comments

Author: YutaLin

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/SnapshotDiffJob.java

@@ -341,7 +341,7 @@ public CodecBuffer toCodecBuffer(@Nonnull SnapshotDiffJob object,
     @Override
     public SnapshotDiffJob fromCodecBuffer(@Nonnull CodecBuffer buffer)
         throws CodecException {
-      // Direct protobuf parsing from InputStream to avoid byte array copy
+      
       try (java.io.InputStream in = buffer.getInputStream()) {
         SnapshotDiffJobProto proto = SnapshotDiffJobProto.parseFrom(in);
         return SnapshotDiffJob.getFromProtoBuf(proto);

hadoop-ozone/common/src/test/java/org/apache/hadoop/ozone/om/helpers/TestOmSnapshotDiffJobCodec.java

@@ -37,7 +37,6 @@ public class TestOmSnapshotDiffJobCodec {
 
   @Test
   public void testOldJsonSerializedDataCanBeReadByNewCodec() throws Exception {
-    // Step 1: Construct a SnapshotDiffJob instance
     SnapshotDiffJob original = new SnapshotDiffJob(
         123456789L,
         "job-001",
@@ -53,13 +52,10 @@ public void testOldJsonSerializedDataCanBeReadByNewCodec() throws Exception {
         0.0
     );
 
-    // Step 2: Serialize using the old Jackson-based codec
     byte[] oldFormatData = oldCodec.toPersistedFormatImpl(original);
 
-    // Step 3: Deserialize using the new default codec (with Protobuf + JSON fallback)
     SnapshotDiffJob parsed = newCodec.fromPersistedFormatImpl(oldFormatData);
 
-    // Step 4: Verify critical fields remain consistent after round-trip
     assertEquals(original.getJobId(), parsed.getJobId());
     assertEquals(original.getStatus(), parsed.getStatus());
     assertEquals(original.getVolume(), parsed.getVolume());