chore(spanner): add missing commit ts logging (#13037)

Author: sakthivelmanii

java-spanner/google-cloud-spanner/src/main/java/com/google/cloud/spanner/TransactionRunnerImpl.java

@@ -527,8 +527,28 @@ public void run() {
                     return;
                   }
                   if (!proto.hasCommitTimestamp()) {
+                    if (proto.hasPrecommitToken() && retryAttemptDueToCommitProtocolExtension) {
+                      txnLogger.log(
+                          Level.FINE,
+                          "Missing commitTimestamp, response has precommit token "
+                              + "and client has already attempted commit retry");
+                      span.addAnnotation(
+                          "Missing commitTimestamp, response has precommit token "
+                              + "and client has already attempted commit retry");
+                    } else if (!proto.hasPrecommitToken()) {
+                      txnLogger.log(
+                          Level.FINE, "Missing commitTimestamp, response has no precommit token");
+                      span.addAnnotation(
+                          "Missing commitTimestamp, " + "response has no precommit token");
+                    }
                     throw newSpannerException(
-                        ErrorCode.INTERNAL, "Missing commitTimestamp:\n" + session.getName());
+                        ErrorCode.INTERNAL,
+                        "Missing commitTimestamp:\n"
+                            + session.getName()
+                            + "\nHas precommit token: "
+                            + proto.hasPrecommitToken()
+                            + "\nAlready attempted commit retry: "
+                            + retryAttemptDueToCommitProtocolExtension);
                   }
                   span.addAnnotation("Commit Done");
                   opSpan.end();