chore(spanner): skip tests if mur for rw is enabled

Author: harshachinta

google-cloud-spanner/src/test/java/com/google/cloud/spanner/MockSpannerServiceImpl.java

@@ -1896,7 +1896,8 @@ public void beginTransaction(
       beginTransactionExecutionTime.simulateExecutionTime(
           exceptions, stickyGlobalExceptions, freezeLock);
       Transaction transaction =
-          beginTransaction(session, request.getOptions(), request.getMutationKey(), request.getRequestOptions());
+          beginTransaction(
+              session, request.getOptions(), request.getMutationKey(), request.getRequestOptions());
       responseObserver.onNext(transaction);
       responseObserver.onCompleted();
     } catch (StatusRuntimeException t) {
@@ -1907,7 +1908,10 @@ public void beginTransaction(
   }
 
   private Transaction beginTransaction(
-      Session session, TransactionOptions options, com.google.spanner.v1.Mutation mutationKey, RequestOptions requestOptions) {
+      Session session,
+      TransactionOptions options,
+      com.google.spanner.v1.Mutation mutationKey,
+      RequestOptions requestOptions) {
     ByteString transactionId = generateTransactionName(session.getName());
     Transaction.Builder builder = Transaction.newBuilder().setId(transactionId);
     if (options != null && options.getModeCase() == ModeCase.READ_ONLY) {
@@ -1922,7 +1926,8 @@ private Transaction beginTransaction(
     Transaction transaction = builder.build();
     transactions.put(transaction.getId(), transaction);
     // Do not add transaction id to transactionsStarted if this request was from background thread
-    if (requestOptions == null || !requestOptions.getTransactionTag().equals("multiplexed-rw-background-begin-txn")) {
+    if (requestOptions == null
+        || !requestOptions.getTransactionTag().equals("multiplexed-rw-background-begin-txn")) {
       transactionsStarted.add(transaction.getId());
     }
     isPartitionedDmlTransaction.put(