Use warn log level for integration tests

Just to limit all the noise from code-server's startup output.

test/utils/integration.ts

@@ -3,7 +3,7 @@ import { runCodeServer } from "../../src/node/main"
 import * as httpserver from "./httpserver"
 
 export async function setup(argv: string[], configFile?: string): Promise<httpserver.HttpServer> {
-  argv = ["--bind-addr=localhost:0", ...argv]
+  argv = ["--bind-addr=localhost:0", "--log=warn", ...argv]
 
   const cliArgs = parse(argv)
   const configArgs = parseConfigFile(configFile || "", "test/integration.ts")