fix(react): allRoutes cannot triple equal a new array instance (#3779)

Running `===` against a newly instantiated array will always return
false. Instead, we should check that `allRoutes` is empty.

Author: sdemjanenko

packages/react/src/reactrouter.tsx

@@ -65,7 +65,7 @@ function createReactRouterInstrumentation(
   }
 
   function getTransactionName(pathname: string): string {
-    if (allRoutes === [] || !matchPath) {
+    if (allRoutes.length === 0 || !matchPath) {
       return pathname;
     }