[Flight] Move pendingChunks ref count increment into createTask (#28260)

Every time we create a task we need to wait for it so we increase a ref
count. We can do this in `createTask`. This is in line with what Fizz
does too.

They differ in that Flight counts when they're actually flushed where as
Fizz decrements them when they complete.

Flight should probably count them when they complete so it's possible to
wait for the end before flushing for buffering purposes.

DiffTrain build for [0d11563](0d11563)

Author: sebmarkbage

compiled/facebook-www/REVISION

@@ -1 +1 @@
-66924457594bc28eb2f3f39c7c61d54b931c188e
+0d11563b4a96e0f4f2361cdf7375b12375688163

compiled/facebook-www/ReactDOMTesting-prod.modern.js

@@ -17067,7 +17067,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1787 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-280d1df6",
+  version: "18.3.0-www-modern-941395b7",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2160 = {
@@ -17098,7 +17098,7 @@ var internals$jscomp$inline_2160 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-280d1df6"
+  reconcilerVersion: "18.3.0-www-modern-941395b7"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2161 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -17526,4 +17526,4 @@ exports.useFormStatus = function () {
     return ReactCurrentDispatcher$2.current.useHostTransitionStatus();
   throw Error(formatProdErrorMessage(248));
 };
-exports.version = "18.3.0-www-modern-280d1df6";
+exports.version = "18.3.0-www-modern-941395b7";

compiled/facebook-www/ReactFlightDOMServer-dev.modern.js

@@ -1146,7 +1146,6 @@ if (__DEV__) {
         onPostpone:
           onPostpone === undefined ? defaultPostponeHandler : onPostpone
       };
-      request.pendingChunks++;
       var rootTask = createTask(request, model, null, false, abortSet);
       pingedTasks.push(rootTask);
       return request;
@@ -1159,7 +1158,6 @@ if (__DEV__) {
     }
 
     function serializeThenable(request, task, thenable) {
-      request.pendingChunks++;
       var newTask = createTask(
         request,
         null,
@@ -1550,6 +1548,7 @@ if (__DEV__) {
     }
 
     function createTask(request, model, keyPath, implicitSlot, abortSet) {
+      request.pendingChunks++;
       var id = request.nextChunkId++;
 
       if (typeof model === "object" && model !== null) {
@@ -1733,7 +1732,6 @@ if (__DEV__) {
     }
 
     function outlineModel(request, value) {
-      request.pendingChunks++;
       var newTask = createTask(
         request,
         value,
@@ -1856,7 +1854,6 @@ if (__DEV__) {
           // $FlowFixMe[method-unbinding]
           if (typeof x.then === "function") {
             // Something suspended, we'll need to create a new task and resolve it later.
-            request.pendingChunks++;
             var newTask = createTask(
               request,
               task.model,

compiled/facebook-www/ReactFlightDOMServer-prod.modern.js

@@ -450,7 +450,6 @@ function defaultErrorHandler(error) {
 function defaultPostponeHandler() {}
 var currentRequest = null;
 function serializeThenable(request, task, thenable) {
-  request.pendingChunks++;
   var newTask = createTask(
     request,
     null,
@@ -649,6 +648,7 @@ function pingTask(request, task) {
     performWork(request));
 }
 function createTask(request, model, keyPath, implicitSlot, abortSet) {
+  request.pendingChunks++;
   var id = request.nextChunkId++;
   "object" !== typeof model ||
     null === model ||
@@ -691,7 +691,6 @@ function createTask(request, model, keyPath, implicitSlot, abortSet) {
             null !== parentPropertyName &&
             "function" === typeof parentPropertyName.then)
         ) {
-          request.pendingChunks++;
           JSCompiler_inline_result = createTask(
             request,
             task.model,
@@ -773,7 +772,6 @@ function serializeClientReference(
   }
 }
 function outlineModel(request, value) {
-  request.pendingChunks++;
   value = createTask(request, value, null, !1, request.abortableTasks);
   retryTask(request, value);
   return value.id;
@@ -1122,7 +1120,6 @@ exports.renderToDestination = function (destination, model, options) {
     onError: void 0 === onError ? defaultErrorHandler : onError,
     onPostpone: defaultPostponeHandler
   };
-  onError.pendingChunks++;
   model = createTask(onError, model, null, !1, abortSet);
   options.push(model);
   onError.flushScheduled = null !== onError.destination;

compiled/facebook-www/ReactTestRenderer-dev.modern.js

@@ -26083,7 +26083,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-www-modern-895f9e13";
+    var ReactVersion = "18.3.0-www-modern-6f034660";
 
     // Might add PROFILE later.