[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and related code (facebook#35755)

This is unused.

DiffTrain build for [8374c2a](facebook@8374c2a)

Author: pull[bot]

compiled/facebook-www/REVISION

@@ -1 +1 @@
-57b79b0388b755096216b2b5308113e54eac3be8
+8374c2abf13fa803233025192b8d7e87de70b087

compiled/facebook-www/REVISION_TRANSFORMS

@@ -1 +1 @@
-57b79b0388b755096216b2b5308113e54eac3be8
+8374c2abf13fa803233025192b8d7e87de70b087

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

@@ -1482,7 +1482,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.3.0-www-classic-57b79b03-20260210";
+    exports.version = "19.3.0-www-classic-8374c2ab-20260211";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -1482,7 +1482,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.3.0-www-modern-57b79b03-20260210";
+    exports.version = "19.3.0-www-modern-8374c2ab-20260211";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -610,4 +610,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-classic-57b79b03-20260210";
+exports.version = "19.3.0-www-classic-8374c2ab-20260211";

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

@@ -610,4 +610,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-modern-57b79b03-20260210";
+exports.version = "19.3.0-www-modern-8374c2ab-20260211";

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

@@ -614,7 +614,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-classic-57b79b03-20260210";
+exports.version = "19.3.0-www-classic-8374c2ab-20260211";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -614,7 +614,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.3.0-www-modern-57b79b03-20260210";
+exports.version = "19.3.0-www-modern-8374c2ab-20260211";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -266,7 +266,9 @@ __DEV__ &&
         case 8:
           return type === REACT_STRICT_MODE_TYPE ? "StrictMode" : "Mode";
         case 22:
-          return "Offscreen";
+          if (null !== fiber.return)
+            return getComponentNameFromFiber(fiber.return);
+          break;
         case 12:
           return "Profiler";
         case 21:
@@ -20381,10 +20383,10 @@ __DEV__ &&
     (function () {
       var internals = {
         bundleType: 1,
-        version: "19.3.0-www-classic-57b79b03-20260210",
+        version: "19.3.0-www-classic-8374c2ab-20260211",
         rendererPackageName: "react-art",
         currentDispatcherRef: ReactSharedInternals,
-        reconcilerVersion: "19.3.0-www-classic-57b79b03-20260210"
+        reconcilerVersion: "19.3.0-www-classic-8374c2ab-20260211"
       };
       internals.overrideHookState = overrideHookState;
       internals.overrideHookStateDeletePath = overrideHookStateDeletePath;
@@ -20419,7 +20421,7 @@ __DEV__ &&
     exports.Shape = Shape;
     exports.Surface = Surface;
     exports.Text = Text;
-    exports.version = "19.3.0-www-classic-57b79b03-20260210";
+    exports.version = "19.3.0-www-classic-8374c2ab-20260211";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

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

@@ -266,7 +266,9 @@ __DEV__ &&
         case 8:
           return type === REACT_STRICT_MODE_TYPE ? "StrictMode" : "Mode";
         case 22:
-          return "Offscreen";
+          if (null !== fiber.return)
+            return getComponentNameFromFiber(fiber.return);
+          break;
         case 12:
           return "Profiler";
         case 21:
@@ -20152,10 +20154,10 @@ __DEV__ &&
     (function () {
       var internals = {
         bundleType: 1,
-        version: "19.3.0-www-modern-57b79b03-20260210",
+        version: "19.3.0-www-modern-8374c2ab-20260211",
         rendererPackageName: "react-art",
         currentDispatcherRef: ReactSharedInternals,
-        reconcilerVersion: "19.3.0-www-modern-57b79b03-20260210"
+        reconcilerVersion: "19.3.0-www-modern-8374c2ab-20260211"
       };
       internals.overrideHookState = overrideHookState;
       internals.overrideHookStateDeletePath = overrideHookStateDeletePath;
@@ -20190,7 +20192,7 @@ __DEV__ &&
     exports.Shape = Shape;
     exports.Surface = Surface;
     exports.Text = Text;
-    exports.version = "19.3.0-www-modern-57b79b03-20260210";
+    exports.version = "19.3.0-www-modern-8374c2ab-20260211";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&