Remove reload on serverComponentChanges in pages (#41020)

This caused unexpected full page reloads when viewing pages in `pages`. E.g. when navigating to `app`. Since `app` is the only place you can have server components now this is no longer needed.


## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

packages/next/client/dev/error-overlay/hot-dev-client.js

@@ -260,16 +260,6 @@ function processMessage(e) {
       )
       return handleSuccess()
     }
-
-    case 'serverComponentChanges': {
-      sendMessage(
-        JSON.stringify({
-          event: 'server-component-reload-page',
-          clientId: window.__nextDevClientId,
-        })
-      )
-      return window.location.reload()
-    }
     default: {
       if (customHmrEventHandler) {
         customHmrEventHandler(obj)