[promises] Fix fuzzer found uncancelable call bug in client promise code (#34909)

Closes #34909

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/34909 from ctiller:lambda-mcfly 92f759d763
PiperOrigin-RevId: 589989462

src/core/lib/channel/connected_channel.cc

@@ -411,6 +411,8 @@ auto ConnectedChannelStream::RecvMessages(
             }
             if (cancel_on_error && !status.ok()) {
               incoming_messages.CloseWithError();
+            } else {
+              incoming_messages.Close();
             }
             return Immediate(LoopCtl<absl::Status>(status.status()));
           };

src/core/lib/surface/call.cc

@@ -2978,7 +2978,8 @@ void ClientPromiseBasedCall::CommitBatch(const grpc_op* ops, size_t nops,
         StartRecvMessage(
             op, completion,
             [this]() {
-              return server_initial_metadata_.receiver.AwaitClosed();
+              return Race(server_initial_metadata_.receiver.AwaitClosed(),
+                          server_to_client_messages_.receiver.AwaitClosed());
             },
             &server_to_client_messages_.receiver, false, spawner);
         break;

test/core/end2end/fuzzers/client_fuzzer_corpus/5061521840340992

@@ -0,0 +1,51 @@
+api_actions {
+  create_call {
+    propagation_mask: 6
+    method {
+      value: "~"
+    }
+    timeout: 34816
+  }
+}
+api_actions {
+  queue_batch {
+    operations {
+      send_initial_metadata {
+      }
+    }
+    operations {
+      send_message {
+      }
+    }
+    operations {
+      receive_message {
+      }
+    }
+  }
+}
+api_actions {
+  create_server {
+  }
+}
+api_actions {
+  disable_tracer: "("
+}
+api_actions {
+  destroy_call {
+  }
+}
+api_actions {
+  poll_cq {
+  }
+}
+api_actions {
+}
+api_actions {
+  shutdown_server {
+  }
+}
+config_vars {
+  verbosity: "\364\204\204\204\364\204\204\204\364\204\204\204\364\204\204\204\364\204\204\204\364\204\204\204\364\204\204\204\364\204\204\204\004"
+  stacktrace_minloglevel: "yyyyyyyyyyyyy&yyyyyyy\177\014"
+  experiments: 1099511626496
+}