Auto-exit after `tns test` completes and allow for console output collection

The currently recommended approach to running tns test in a CI environment is to use the --justlaunch switch, so that tns exits after the test run completes.

• We need a way to run without --justlaunch, so we show console.log and other output to the user and let CI systems collect it in their build logs.
• We also need a --timeout parameter that will kill the test run if it doesn't complete in X minutes/seconds.

从 tns test 命令开始，跟踪现有的 --justlaunch 行为。通过保留 CI 所需的控制台输出、添加 --timeout 参数，并在测试运行完成或超时时自动结束测试运行，来定义完成条件。