Concurrent rendering for ReactART-test (#28521)

## Summary

We need to unblock flipping the default for RTR to be concurrent
rendering. Update ReactART-test to use `unstable_isConcurrent` in place.

## How did you test this change?

`yarn test packages/react-art/src/__tests__/ReactART-test.js`

DiffTrain build for commit https://github.com/facebook/react/commit/bc13750bdf9ca29c7d23a71c5760c21a78cf3fc4.

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

@@ -25454,7 +25454,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-canary-0aab065eb-20240318";
+    var ReactVersion = "18.3.0-canary-bc13750bd-20240318";
 
     // Might add PROFILE later.
 

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

@@ -9175,7 +9175,7 @@ var devToolsConfig$jscomp$inline_1016 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-0aab065eb-20240318",
+  version: "18.3.0-canary-bc13750bd-20240318",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1194 = {
@@ -9206,7 +9206,7 @@ var internals$jscomp$inline_1194 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-0aab065eb-20240318"
+  reconcilerVersion: "18.3.0-canary-bc13750bd-20240318"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1195 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -9603,7 +9603,7 @@ var devToolsConfig$jscomp$inline_1058 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-0aab065eb-20240318",
+  version: "18.3.0-canary-bc13750bd-20240318",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1235 = {
@@ -9634,7 +9634,7 @@ var internals$jscomp$inline_1235 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-0aab065eb-20240318"
+  reconcilerVersion: "18.3.0-canary-bc13750bd-20240318"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1236 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -26,7 +26,7 @@ if (__DEV__) {
     }
     var dynamicFlags = require("ReactNativeInternalFeatureFlags");
 
-    var ReactVersion = "18.3.0-canary-0aab065eb-20240318";
+    var ReactVersion = "18.3.0-canary-bc13750bd-20240318";
 
     // ATTENTION
     // When adding new symbols to this file,

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

@@ -628,4 +628,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-canary-0aab065eb-20240318";
+exports.version = "18.3.0-canary-bc13750bd-20240318";

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

@@ -624,7 +624,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-canary-0aab065eb-20240318";
+exports.version = "18.3.0-canary-bc13750bd-20240318";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/REVISION

@@ -1 +1 @@
-0aab065eb3250a9714a62dc05587cbb571da7f71
+bc13750bdf9ca29c7d23a71c5760c21a78cf3fc4