return router from getRouter() function

### Steps to Reproduce

In tanstack start react docs

[Step 2: Configure](https://docs.sentry.io/platforms/javascript/guides/tanstackstart-react/#step-2-configure)

return router variable after client side sentry integration


### Expected Result

return router from getRouter()

### Actual Result

Currently you are not returing router variable from getRouter()

### Additional Info

_No response_