NO-JIRA: adjust HttpWaitStrategy path in codeserver.spec.ts because after package updates 302 is no longer a success (opendatahub-io#1201)

```
❯ curl -vvvv http://localhost:35929/
* Host localhost:35929 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:35929...
* Connected to localhost (::1) port 35929
> GET / HTTP/1.1
> Host: localhost:35929
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 302 Found
< Location: ./?folder=/opt/app-root/src
< Vary: Accept, Accept-Encoding
< Content-Type: text/plain; charset=utf-8
< Content-Length: 49
< Date: Thu, 26 Jun 2025 18:18:11 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
<
* Connection #0 to host localhost left intact
Found. Redirecting to ./?folder=/opt/app-root/src
```

Author: jiridanek

tests/browser/tests/codeserver.spec.ts

@@ -43,7 +43,7 @@ const test = base.extend<MyFixtures>({
       })()
       const container = await new GenericContainer(image)
           .withExposedPorts(8787)
-          .withWaitStrategy(new HttpWaitStrategy('/', 8787, {abortOnContainerExit: true}))
+          .withWaitStrategy(new HttpWaitStrategy('/?folder=/opt/app-root/src', 8787, {abortOnContainerExit: true}))
           .start();
       await use(new CodeServer(page, `http://${container.getHost()}:${container.getMappedPort(8787)}`))
       await container.stop()