[Fiber] Refactor Commit Phase into Separate Functions for Before Mutation/Mutation/Layout (#31930)

This is doing some general clean up to be able to split the commit root three phases into three separate async steps.

DiffTrain build for [c81312e](c81312e)

Author: sebmarkbage

compiled/facebook-www/REVISION

@@ -1 +1 @@
-d8b903f49edebdd9ed081ff0514c28fe130cd510
+c81312e3a78dcbf71ed98c8893abe6dbfeaef3f2

compiled/facebook-www/REVISION_TRANSFORMS

@@ -1 +1 @@
-d8b903f49edebdd9ed081ff0514c28fe130cd510
+c81312e3a78dcbf71ed98c8893abe6dbfeaef3f2

compiled/facebook-www/React-dev.classic.js

@@ -1942,7 +1942,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.1.0-www-classic-d8b903f4-20250102";
+    exports.version = "19.1.0-www-classic-c81312e3-20250102";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -1942,7 +1942,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.1.0-www-modern-d8b903f4-20250102";
+    exports.version = "19.1.0-www-modern-c81312e3-20250102";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-prod.classic.js

@@ -630,4 +630,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.1.0-www-classic-d8b903f4-20250102";
+exports.version = "19.1.0-www-classic-c81312e3-20250102";

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

@@ -630,4 +630,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.1.0-www-modern-d8b903f4-20250102";
+exports.version = "19.1.0-www-modern-c81312e3-20250102";

compiled/facebook-www/React-profiling.classic.js

@@ -634,7 +634,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.1.0-www-classic-d8b903f4-20250102";
+exports.version = "19.1.0-www-classic-c81312e3-20250102";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled/facebook-www/React-profiling.modern.js

@@ -634,7 +634,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.1.0-www-modern-d8b903f4-20250102";
+exports.version = "19.1.0-www-modern-c81312e3-20250102";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&