chore(e2e): allow multi import of core

Author: wmertens

starters/dev-server.ts

@@ -258,7 +258,8 @@ async function routerApp(
   appDir: string,
 ) {
   const ssrPath = join(appDir, "server", `${qwikRouterVirtualEntry}.js`);
-
+  // it's ok in the devserver to import core multiple times
+  (globalThis as any).__qwik = null;
   const mod = await import(file(ssrPath));
   const router: any = mod.router;
   router(req, res, () => {
@@ -276,6 +277,8 @@ async function ssrApp(
   manifest: QwikManifest,
 ) {
   const ssrPath = join(appDir, "server", "entry.ssr.js");
+  // it's ok in the devserver to import core multiple times
+  (globalThis as any).__qwik = null;
   const mod = await import(file(ssrPath));
   const render: Render = mod.default ?? mod.render;