fix: add VSCODE_PROXY_URI to e2e model

Author: jsjoeio

test/e2e/models/CodeServer.ts

@@ -135,6 +135,10 @@ export class CodeServer {
         env: {
           ...process.env,
           ...this.env,
+          // Set to empty string to prevent code-server from
+          // using the existing instance when running the e2e tests
+          // from an integrated terminal.
+          VSCODE_IPC_HOOK_CLI: "", 
           PASSWORD,
         },
       })