Make prerendering always non-blocking with fix (#31452)

We've previously failed to land this change due to some internal apps
seeing infinite render loops due to external store state updates during
render. It turns out that since the `renderWasConcurrent` var was moved
into the do block, the sync render triggered from the external store
check was stuck with a `RootSuspended` `exitStatus`. So this is not
unique to sibling prerendering but more generally related to how we
handle update to a sync external store during render.

We've tested this build against local repros which now render without
crashes. We will try to add a unit test to cover the scenario as well.

---------

Co-authored-by: Andrew Clark <git@andrewclark.io>
Co-authored-by: Rick Hanlon <rickhanlonii@fb.com>

DiffTrain build for [989af12](989af12)

compiled-rn/VERSION_NATIVE_FB

@@ -1 +1 @@
-19.0.0-native-fb-5c56b873-20241107
+19.0.0-native-fb-989af12f-20241108

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<5c9a804b7140967367e1adde199edc5b>>
+ * @generated SignedSource<<d3072dc54c06b9fce9de2382ae8e659b>>
  */
 
 "use strict";
@@ -420,5 +420,5 @@ __DEV__ &&
     exports.useFormStatus = function () {
       return resolveDispatcher().useHostTransitionStatus();
     };
-    exports.version = "19.0.0-native-fb-5c56b873-20241107";
+    exports.version = "19.0.0-native-fb-989af12f-20241108";
   })();

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react-dom/cjs/ReactDOM-prod.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<ccd360770cecadb5ca13dc9612c85dc8>>
+ * @generated SignedSource<<dd9c52551f32d06520da8c1e032485fc>>
  */
 
 "use strict";
@@ -203,4 +203,4 @@ exports.useFormState = function (action, initialState, permalink) {
 exports.useFormStatus = function () {
   return ReactSharedInternals.H.useHostTransitionStatus();
 };
-exports.version = "19.0.0-native-fb-5c56b873-20241107";
+exports.version = "19.0.0-native-fb-989af12f-20241108";

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react-dom/cjs/ReactDOM-profiling.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<ccd360770cecadb5ca13dc9612c85dc8>>
+ * @generated SignedSource<<dd9c52551f32d06520da8c1e032485fc>>
  */
 
 "use strict";
@@ -203,4 +203,4 @@ exports.useFormState = function (action, initialState, permalink) {
 exports.useFormStatus = function () {
   return ReactSharedInternals.H.useHostTransitionStatus();
 };
-exports.version = "19.0.0-native-fb-5c56b873-20241107";
+exports.version = "19.0.0-native-fb-989af12f-20241108";