Bugfix: useFormState queues actions in wrong order (#27570)

I neglected to update the "last" pointer of the action queue. Since the
queue is circular, rather than dropping the update, the effect was to
add the update to the front of the queue instead of the back. I didn't
notice earlier because in my demos/tests, the actions would either
resolve really quickly or the actions weren't order dependent (like
incrementing a counter).

DiffTrain build for [b8e47d9](b8e47d9)

Author: acdlite

compiled/facebook-www/REVISION

@@ -1 +1 @@
-05fbd1aab036ecbd14469d6376024439bc931f68
+b8e47d988eb3ba547c102c0b12c351250ed955e0

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

@@ -587,4 +587,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-www-classic-252d6948";
+exports.version = "18.3.0-www-classic-5fd0277f";

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

@@ -8330,7 +8330,7 @@ function dispatchFormState(fiber, actionQueue, setState, payload) {
       payload: payload,
       next: first
     };
-    last.next = _newLast;
+    actionQueue.pending = last.next = _newLast;
   }
 }
 
@@ -25267,7 +25267,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-classic-252d6948";
+var ReactVersion = "18.3.0-www-classic-5fd0277f";
 
 // Might add PROFILE later.
 

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

@@ -8330,7 +8330,7 @@ function dispatchFormState(fiber, actionQueue, setState, payload) {
       payload: payload,
       next: first
     };
-    last.next = _newLast;
+    actionQueue.pending = last.next = _newLast;
   }
 }
 
@@ -25267,7 +25267,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-modern-cc07473f";
+var ReactVersion = "18.3.0-www-modern-c5313fe8";
 
 // Might add PROFILE later.