Fix Flow types of useEffectEvent (#26468)

## Summary

Just copied the types over from the internal types. Type error was
hidden by overly broad FlowFixMe. With `$FlowFixMe[not-a-function]` we
would've seen the actual issue:
```
Cannot return `dispatcher.useEffectEvent(...)` because  `T` [1] is incompatible with  undefined [2].Flow(incompatible-return)
```

## How did you test this change?

- [x] yarn flow dom-node
- [x] CI

DiffTrain build for [d12bdcd](d12bdcd)

compiled/facebook-www/REVISION

@@ -1 +1 @@
-73b6435ca4e0c3ae3aac8126509a82420a84f0d7
+d12bdcda69afd219f4d91cbd60d6fae2a375d35b

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

@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-www-classic-e762d1a9";
+var ReactVersion = "18.3.0-www-classic-1745b9a1";
 
 // ATTENTION
 // When adding new symbols to this file,
@@ -2011,22 +2011,22 @@ function useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot) {
   );
 }
 function useCacheRefresh() {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useCacheRefresh();
 }
 function use(usable) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.use(usable);
 }
 function useMemoCache(size) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useMemoCache(size);
 }
 function useEffectEvent(callback) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useEffectEvent(callback);
 }

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

@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-www-modern-11df97fe";
+var ReactVersion = "18.3.0-www-modern-770d70a2";
 
 // ATTENTION
 // When adding new symbols to this file,
@@ -2011,22 +2011,22 @@ function useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot) {
   );
 }
 function useCacheRefresh() {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useCacheRefresh();
 }
 function use(usable) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.use(usable);
 }
 function useMemoCache(size) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useMemoCache(size);
 }
 function useEffectEvent(callback) {
-  var dispatcher = resolveDispatcher(); // $FlowFixMe This is unstable, thus optional
+  var dispatcher = resolveDispatcher(); // $FlowFixMe[not-a-function] This is unstable, thus optional
 
   return dispatcher.useEffectEvent(callback);
 }

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

@@ -15987,7 +15987,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1754 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-11df97fe",
+  version: "18.3.0-www-modern-770d70a2",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2154 = {
@@ -16018,7 +16018,7 @@ var internals$jscomp$inline_2154 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-11df97fe"
+  reconcilerVersion: "18.3.0-www-modern-770d70a2"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2155 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -16338,4 +16338,4 @@ exports.unstable_createEventHandle = function (type, options) {
   return eventHandle;
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-www-modern-11df97fe";
+exports.version = "18.3.0-www-modern-770d70a2";

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

@@ -24353,7 +24353,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-modern-11df97fe";
+var ReactVersion = "18.3.0-www-modern-770d70a2";
 
 // Might add PROFILE later.