Combine createElement and JSX modules (#28320)

Depends on:

- #28317

---

There's a ton of overlap between the createElement implementation and
the JSX implementation, so I combined them into a single module.

In the actual build output, the shared code between JSX and
createElement will get duplicated anyway, because react/jsx-runtime and
react (where createElement lives) are separate, flat build artifacts.

So this is more about code organization — with a few key exceptions, the
implementations of createElement and jsx are highly coupled.

DiffTrain build for commit 5fb2c93.

Author: acdlite

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

@@ -25686,7 +25686,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-canary-ec160f32c-20240219";
+    var ReactVersion = "18.3.0-canary-5fb2c93f3-20240219";
 
     // Might add PROFILE later.
 

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

@@ -9176,7 +9176,7 @@ var devToolsConfig$jscomp$inline_1014 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-ec160f32c-20240219",
+  version: "18.3.0-canary-5fb2c93f3-20240219",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1195 = {
@@ -9207,7 +9207,7 @@ var internals$jscomp$inline_1195 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-ec160f32c-20240219"
+  reconcilerVersion: "18.3.0-canary-5fb2c93f3-20240219"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1196 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -9604,7 +9604,7 @@ var devToolsConfig$jscomp$inline_1056 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-ec160f32c-20240219",
+  version: "18.3.0-canary-5fb2c93f3-20240219",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1236 = {
@@ -9635,7 +9635,7 @@ var internals$jscomp$inline_1236 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-ec160f32c-20240219"
+  reconcilerVersion: "18.3.0-canary-5fb2c93f3-20240219"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1237 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<dcd2c20e1a26861ff0f60d651a2f6e93>>
+ * @generated SignedSource<<9d1803d74418a7ac44bc89ae8cd0f170>>
  */
 
 "use strict";
@@ -1025,13 +1025,11 @@ if (__DEV__) {
      */
 
     function isValidElement(object) {
-      {
-        return (
-          typeof object === "object" &&
-          object !== null &&
-          object.$$typeof === REACT_ELEMENT_TYPE
-        );
-      }
+      return (
+        typeof object === "object" &&
+        object !== null &&
+        object.$$typeof === REACT_ELEMENT_TYPE
+      );
     }
     var ownerHasKeyUseWarning = {};
     /**

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<040e6a4059e2c6d1c22e6d708cbf3b39>>
+ * @generated SignedSource<<8af9696c59d9d4cfa4cc835b5a54e94e>>
  */
 
 "use strict";
@@ -1061,13 +1061,11 @@ if (__DEV__) {
      */
 
     function isValidElement(object) {
-      {
-        return (
-          typeof object === "object" &&
-          object !== null &&
-          object.$$typeof === REACT_ELEMENT_TYPE
-        );
-      }
+      return (
+        typeof object === "object" &&
+        object !== null &&
+        object.$$typeof === REACT_ELEMENT_TYPE
+      );
     }
     var ownerHasKeyUseWarning = {};
     /**