chore: revert Batch.commit idempotency logic

Author: sinhasubham

google/cloud/spanner_v1/batch.py

@@ -243,10 +243,8 @@ def commit(
             observability_options=getattr(database, "observability_options", None),
             metadata=metadata,
         ) as span, MetricsCapture():
-            nth_request = getattr(database, "_next_nth_request", 0)
 
             def wrapped_method():
-                attempt = AtomicCounter(0)
                 commit_request = CommitRequest(
                     session=session.name,
                     mutations=mutations,
@@ -255,12 +253,9 @@ def wrapped_method():
                     max_commit_delay=max_commit_delay,
                     request_options=request_options,
                 )
-                # This code is retried due to ABORTED, hence nth_request
-                # should be increased. attempt can only be increased if
-                # we encounter UNAVAILABLE or INTERNAL.
                 call_metadata, error_augmenter = database.with_error_augmentation(
-                    nth_request,
-                    attempt.increment(),
+                    getattr(database, "_next_nth_request", 0),
+                    1,
                     metadata,
                     span,
                 )
@@ -379,8 +374,6 @@ def batch_write(self, request_options=None, exclude_txn_from_change_streams=Fals
             observability_options=getattr(database, "observability_options", None),
             metadata=metadata,
         ) as span, MetricsCapture():
-            attempt = AtomicCounter(0)
-            nth_request = getattr(database, "_next_nth_request", 0)
 
             def wrapped_method():
                 batch_write_request = BatchWriteRequest(
@@ -393,8 +386,8 @@ def wrapped_method():
                     api.batch_write,
                     request=batch_write_request,
                     metadata=database.metadata_with_request_id(
-                        nth_request,
-                        attempt.increment(),
+                        getattr(database, "_next_nth_request", 0),
+                        1,
                         metadata,
                         span,
                     ),