Change yarn test to default to experimental (#26741)

The idea is that the default `yarn test` command should be the one that
includes the most bleeding edge features, because during development you
probably want as many features enabled as possible.

That used to be `www-modern` but nowadays it's `experimental` because
we've landed a bunch of async actions stuff in experimental but it isn't
yet being tested at Meta.

So this switches the default to `experimental`.

DiffTrain build for commit https://github.com/facebook/react/commit/b5810163e913e8c95a7a0a6dee039bc102e3c987.

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

@@ -23918,7 +23918,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-canary-fda1f0b90-20230509";
+var ReactVersion = "18.3.0-canary-b5810163e-20230509";
 
 // Might add PROFILE later.
 

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

@@ -8623,7 +8623,7 @@ var devToolsConfig$jscomp$inline_1039 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-fda1f0b90-20230509",
+  version: "18.3.0-canary-b5810163e-20230509",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1238 = {
@@ -8654,7 +8654,7 @@ var internals$jscomp$inline_1238 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-fda1f0b90-20230509"
+  reconcilerVersion: "18.3.0-canary-b5810163e-20230509"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1239 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -9049,7 +9049,7 @@ var devToolsConfig$jscomp$inline_1081 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "18.3.0-canary-fda1f0b90-20230509",
+  version: "18.3.0-canary-b5810163e-20230509",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1279 = {
@@ -9080,7 +9080,7 @@ var internals$jscomp$inline_1279 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-canary-fda1f0b90-20230509"
+  reconcilerVersion: "18.3.0-canary-b5810163e-20230509"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1280 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

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

@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-canary-fda1f0b90-20230509";
+var ReactVersion = "18.3.0-canary-b5810163e-20230509";
 
 // ATTENTION
 // When adding new symbols to this file,

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

@@ -642,4 +642,4 @@ exports.useSyncExternalStore = function (
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-canary-fda1f0b90-20230509";
+exports.version = "18.3.0-canary-b5810163e-20230509";

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

@@ -645,7 +645,7 @@ exports.useSyncExternalStore = function (
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-canary-fda1f0b90-20230509";
+exports.version = "18.3.0-canary-b5810163e-20230509";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (

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

@@ -1 +1 @@
-fda1f0b902b527089fe5ae7b3aa573c633166ec9
+b5810163e913e8c95a7a0a6dee039bc102e3c987