[Fiber] Delete isMounted internals (#31966)

The public API has been deleted a long time ago so this should be unused unless it's used by hacks. It should be replaced with an effect/lifecycle that manually tracks this if you need it. The problem with this API is how the timing implemented because it requires Placement/Hydration flags to be cleared too early. In fact, that's why we also have a separate PlacementDEV flag that works differently. https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberCommitWork.js#L2157-L2165 We should be able to remove this code now. DiffTrain build for [e30c669](e30c669)
facebook · Jan 8, 2025 · 70e242e · 70e242e
1 parent d46b089
commit 70e242e
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diff --git a/compiled/facebook-www/REVISION b/compiled/facebook-www/REVISION
@@ -1 +1 @@
-e30c6693e4c7f2aec25b07f5df69a87163dbee81
+a4d122f2d192fe0b6480e669cca43c8f953aaf85
diff --git a/compiled/facebook-www/REVISION_TRANSFORMS b/compiled/facebook-www/REVISION_TRANSFORMS
@@ -1 +1 @@
-e30c6693e4c7f2aec25b07f5df69a87163dbee81
+a4d122f2d192fe0b6480e669cca43c8f953aaf85
diff --git a/compiled/facebook-www/React-dev.classic.js b/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-379089d2-20250108";
+    exports.version = "19.1.0-www-classic-e30c6693-20250108";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

diff --git a/compiled/facebook-www/React-dev.modern.js b/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-379089d2-20250108";
+    exports.version = "19.1.0-www-modern-e30c6693-20250108";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

diff --git a/compiled/facebook-www/React-prod.classic.js b/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-379089d2-20250108";
+exports.version = "19.1.0-www-classic-e30c6693-20250108";
diff --git a/compiled/facebook-www/React-prod.modern.js b/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-379089d2-20250108";
+exports.version = "19.1.0-www-modern-e30c6693-20250108";
diff --git a/compiled/facebook-www/React-profiling.classic.js b/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-379089d2-20250108";
+exports.version = "19.1.0-www-classic-e30c6693-20250108";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

diff --git a/compiled/facebook-www/React-profiling.modern.js b/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-379089d2-20250108";
+exports.version = "19.1.0-www-modern-e30c6693-20250108";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&
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		e30c6693e4c7f2aec25b07f5df69a87163dbee81
		a4d122f2d192fe0b6480e669cca43c8f953aaf85