[Fizz] Track postpones in fallbacks (#27421)

This fixes so that you can postpone in a fallback. This postpones the
parent boundary. I track the fallbacks in a separate replay node so that
when we resume, we can replay the fallback itself and finish the
fallback and then possibly later the content. By doing this we also
ensure we don't complete the parent too early since now it has a render
task on it.

There is one case that this surfaces that isn't limited to
prerender/resume but also render/hydrateRoot. I left todos in the tests
for this.

If you postpone in a fallback, and suspend in the content but eventually
don't postpone in the content then we should be able to just skip
postponing since the content rendered and we no longer need the
fallback. This is a bit of a weird edge case though since fallbacks are
supposed to be very minimal.

This happens because in both cases the fallback starts rendering early
as soon as the content suspends. This also ensures that the parent
doesn't complete early by increasing the blocking tasks. Unfortunately,
the fallback will irreversibly postpone its parent boundary as soon as
it hits a postpone.

When you suspend, the same thing happens but we typically deal with this
by doing a "soft" abort on the fallback since we don't need it anymore
which unblocks the parent boundary. We can't do that with postpone right
now though since it's considered a terminal state.

I think I'll just leave this as is for now since it's an edge case but
it's an annoying exception in the model. Makes me feel I haven't quite
nailed it just yet.

DiffTrain build for commit bff6be8.

Author: sebmarkbage

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react-test-renderer/cjs/ReactTestRenderer-dev.js

@@ -23985,7 +23985,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-canary-94d5b5b2b-20230925";
+var ReactVersion = "18.3.0-canary-bff6be8eb-20230925";
 
 // Might add PROFILE later.
 

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react-test-renderer/cjs/ReactTestRenderer-prod.js

@@ -8620,7 +8620,7 @@ var devToolsConfig$jscomp$inline_1027 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-94d5b5b2b-20230925",
+  version: "18.3.0-canary-bff6be8eb-20230925",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1226 = {
@@ -8651,7 +8651,7 @@ var internals$jscomp$inline_1226 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-94d5b5b2b-20230925"
+  reconcilerVersion: "18.3.0-canary-bff6be8eb-20230925"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1227 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react-test-renderer/cjs/ReactTestRenderer-profiling.js

@@ -9046,7 +9046,7 @@ var devToolsConfig$jscomp$inline_1069 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-94d5b5b2b-20230925",
+  version: "18.3.0-canary-bff6be8eb-20230925",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1267 = {
@@ -9077,7 +9077,7 @@ var internals$jscomp$inline_1267 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-94d5b5b2b-20230925"
+  reconcilerVersion: "18.3.0-canary-bff6be8eb-20230925"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1268 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/cjs/React-dev.js

@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-canary-94d5b5b2b-20230925";
+var ReactVersion = "18.3.0-canary-bff6be8eb-20230925";
 
 // ATTENTION
 // When adding new symbols to this file,

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/cjs/React-prod.js

@@ -616,4 +616,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-canary-94d5b5b2b-20230925";
+exports.version = "18.3.0-canary-bff6be8eb-20230925";

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/cjs/React-profiling.js

@@ -619,7 +619,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-canary-94d5b5b2b-20230925";
+exports.version = "18.3.0-canary-bff6be8eb-20230925";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/REVISION

@@ -1 +1 @@
-94d5b5b2bf5204ebd289a113989c0e2c51b626ef
+bff6be8eb1d77980c13f3e01be63cb813a377058