ClassCastException: com.google.protobuf.Timestamp cannot be cast to IndexedRecord during merge when using Protobuf-derived Avro schemas

### Bug Description

**What happened:**
Jobs using Protobuf-derived Avro schemas fail during merge with:
```
java.lang.ClassCastException: com.google.protobuf.Timestamp cannot be cast to
org.apache.avro.generic.IndexedRecord
```
hudi-utilities-bundle 1.1.1 ships 735 unshaded `com.google.protobuf.*` classes. When HoodieMergeHelper passes the writer schema to HoodieAvroParquetReader, parquet-avro's AvroReadSupport defaults to SpecificData, which resolves nested record types via `Class.forName(schema.getFullName())`. For a `google.protobuf.Timestamp` field the full Avro name is "com.google.protobuf.Timestamp" — the unshaded class is on the classpath, the lookup succeeds, and the returned Protobuf object does not implement IndexedRecord, triggering the exception.

The `com.google.protobuf` shade relocation present in hudi-utilities-bundle in 1.0.2 relocated all protobuf classes to `org.apache.hudi.com.google.protobuf`, making Class.forName("com.google.protobuf.Timestamp") fail gracefully and fall back to GenericData.Record. This relocation was dropped in 1.1.1.

**What you expected:**
Merge should succeed.

**Steps to reproduce:**

1. Use hudi-utilities-bundle 1.1.1 with a Hudi table whose records contain a Protobuf-derived Avro schema with a nested `com.google.protobuf.Timestamp` field (Avro full name "com.google.protobuf.Timestamp"). For example.
```
{
"type": "record",
"name": "MyEvent",
"namespace": "com.example",
"fields": [
{
"name": "payload",
"type": ["null", {
"type": "record",
"name": "MyRecord",
"namespace": "com.example",
"fields": [
{"name": "id", "type": "string", "default": ""},
{
"name": "created_at",
"type": ["null", {
"type": "record",
"name": "Timestamp",
"namespace": "com.google.protobuf",
"fields": [
{"name": "seconds", "type": "long"},
{"name": "nanos", "type": "int"}
]
}],
"default": null
}
]
}],
"default": null
}
]
}
```
2. Run a DeltaStreamer ingestion job that triggers a merge (e.g. COPY_ON_WRITE with updates).
3. Observe `ClassCastException` in the Spark driver log during `HoodieMergeHelper.runMerge()`.
4. Workaround: Set `parquet.avro.data.supplier=org.apache.parquet.avro.GenericDataSupplier` in Hadoop config to bypass SpecificData entirely.

**Proposed Fix:**
Restore the com.google.protobuf relocation rule in packaging/hudi-utilities-bundle/pom.xml:
```

com.google.protobuf
org.apache.hudi.com.google.protobuf

```

### Environment

**Hudi version:** 1.1.1

### Logs and Stack Trace

```
Caused by: java.lang.ClassCastException: class com.google.protobuf.Timestamp cannot be cast to class org.apache.avro.generic.IndexedRecord (com.google.protobuf.Timestamp and org.apache.avro.generic.IndexedRecord are in unnamed module of loader 'app')
at org.apache.avro.generic.GenericData.setField(GenericData.java:851) ~[avro-1.11.4.jar:1.11.4]
at org.apache.parquet.avro.AvroRecordConverter.set(AvroRecordConverter.java:474) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.parquet.avro.AvroRecordConverter$2.add(AvroRecordConverter.java:139) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.parquet.avro.ParentValueContainer.addLong(ParentValueContainer.java:62) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.parquet.avro.AvroConverters$FieldLongConverter.addLong(AvroConverters.java:158) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.parquet.column.impl.ColumnReaderBase$2$4.writeValue(ColumnReaderBase.java:325) ~[parquet-column-1.13.1.jar:1.13.1]
at org.apache.parquet.column.impl.ColumnReaderBase.writeCurrentValueToConverter(ColumnReaderBase.java:440) ~[parquet-column-1.13.1.jar:1.13.1]
at org.apache.parquet.column.impl.ColumnReaderImpl.writeCurrentValueToConverter(ColumnReaderImpl.java:30) ~[parquet-column-1.13.1.jar:1.13.1]
at org.apache.parquet.io.RecordReaderImplementation.read(RecordReaderImplementation.java:406) ~[parquet-column-1.13.1.jar:1.13.1]
at org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:234) ~[parquet-hadoop-1.13.1.jar:1.13.1]
at org.apache.parquet.hadoop.ParquetReader.read(ParquetReader.java:132) ~[parquet-hadoop-1.13.1.jar:1.13.1]
at org.apache.parquet.hadoop.ParquetReader.read(ParquetReader.java:136) ~[parquet-hadoop-1.13.1.jar:1.13.1]
at org.apache.hudi.common.util.ParquetReaderIterator.hasNext(ParquetReaderIterator.java:49) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.common.table.read.buffer.KeyBasedFileGroupRecordBuffer.doHasNext(KeyBasedFileGroupRecordBuffer.java:147) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.common.table.read.buffer.FileGroupRecordBuffer.hasNext(FileGroupRecordBuffer.java:153) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.common.table.read.HoodieFileGroupReader.hasNext(HoodieFileGroupReader.java:246) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.common.table.read.HoodieFileGroupReader$HoodieFileGroupReaderIterator.hasNext(HoodieFileGroupReader.java:333) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.common.util.collection.MappingIterator.hasNext(MappingIterator.java:39) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.io.FileGroupReaderBasedMergeHandle.doMerge(FileGroupReaderBasedMergeHandle.java:271) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.io.IOUtils.runMerge(IOUtils.java:121) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.table.action.commit.BaseSparkCommitActionExecutor.handleUpdate(BaseSparkCommitActionExecutor.java:390) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]
at org.apache.hudi.table.action.commit.BaseSparkCommitActionExecutor.handleUpsertPartition(BaseSparkCommitActionExecutor.java:356) ~[hudi-spark3.5-bundle_2.12-1.1.1-scwx-1.jar:1.1.1-scwx-1]```

Open packaging/hudi-utilities-bundle/pom.xml and inspect the shading rules for com.google.protobuf; the issue identifies the missing relocation and the affected HoodieMergeHelper.runMerge path. Restore the relocation, then reproduce a DeltaStreamer merge with a nested com.google.protobuf.Timestamp field and verify that the merge completes without the ClassCastException.

Written by the indexing model from the issue text.