Fix flaky test by pinning esm.sh version and importing react-is

Co-authored-by: Archmonger <16909269+Archmonger@users.noreply.github.com>

Author: Copilot

tests/test_reactjs/js_fixtures/subcomponent-notation.js

@@ -1,6 +1,7 @@
-import React from "https://esm.sh/react@19.0"
-import ReactDOM from "https://esm.sh/react-dom@19.0/client"
-import {InputGroup, Form} from "https://esm.sh/react-bootstrap@2.10.2?deps=react@19.0,react-dom@19.0,react-is@19.0&exports=InputGroup,Form";
+import React from "https://esm.sh/v135/react@19.0"
+import ReactDOM from "https://esm.sh/v135/react-dom@19.0/client"
+import * as ReactIs from "https://esm.sh/v135/react-is@19.0"
+import {InputGroup, Form} from "https://esm.sh/v135/react-bootstrap@2.10.2?deps=react@19.0,react-dom@19.0,react-is@19.0&exports=InputGroup,Form";
 export {InputGroup, Form};
 
 export function bind(node, config) {

tests/test_web/js_fixtures/subcomponent-notation.js

@@ -1,6 +1,7 @@
-import React from "https://esm.sh/react@19.0"
-import ReactDOM from "https://esm.sh/react-dom@19.0/client"
-import {InputGroup, Form} from "https://esm.sh/react-bootstrap@2.10.2?deps=react@19.0,react-dom@19.0,react-is@19.0&exports=InputGroup,Form";
+import React from "https://esm.sh/v135/react@19.0"
+import ReactDOM from "https://esm.sh/v135/react-dom@19.0/client"
+import * as ReactIs from "https://esm.sh/v135/react-is@19.0"
+import {InputGroup, Form} from "https://esm.sh/v135/react-bootstrap@2.10.2?deps=react@19.0,react-dom@19.0,react-is@19.0&exports=InputGroup,Form";
 export {InputGroup, Form};
 
 export function bind(node, config) {