GH-37562: [Ruby] Add support for table.each_raw_record.to_a (#37600)

### Rationale for this change

This change aligns the behavior of `each_raw_record` with standard Ruby practices by returning an enumerator when no block is provided

### What changes are included in this PR?

- Made `Arrow::Table#each_raw_record` and `Arrow::RecordBatch#each_raw_record` return Enumerator when it was called without block.
- Added related tests
- Resolved warnings related to duplicate test classes which were caused by #37137

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No

* Closes: #37562

Authored-by: otegami <a.s.takuya1026@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

ruby/red-arrow/ext/arrow/raw-records.cpp

@@ -305,9 +305,10 @@ namespace red_arrow {
   }
 
   VALUE
-  record_batch_each_raw_record(VALUE rb_record_batch){
+  record_batch_each_raw_record(VALUE rb_record_batch) {
     auto garrow_record_batch = GARROW_RECORD_BATCH(RVAL2GOBJ(rb_record_batch));
     auto record_batch = garrow_record_batch_get_raw(garrow_record_batch).get();
+    RETURN_SIZED_ENUMERATOR(rb_record_batch, 0, nullptr, record_batch->num_rows());
 
     try {
       RawRecordsProducer producer;
@@ -323,6 +324,7 @@ namespace red_arrow {
   table_each_raw_record(VALUE rb_table) {
     auto garrow_table = GARROW_TABLE(RVAL2GOBJ(rb_table));
     auto table = garrow_table_get_raw(garrow_table).get();
+    RETURN_SIZED_ENUMERATOR(rb_table, 0, nullptr, table->num_rows());
 
     try {
       RawRecordsProducer producer;