Integration tests must only go through the real file system/process manager/platform. The global indirection makes this code harder to understand than if it directly referred to the concrete instances that are being used.

Update the integration shard to use a const instance of a LocalFIleSystem, LocalProcessManager, and LocalPlatform. Remove global usage and apply testWithoutContext.

Skip unnecessary parsing of chrome URI. Ensure stack traces are initialized in web server. Disclaimer on web server that it does not support debugging and remove help message. Fix generated entrypoint to check for main(List<String> args)

- Fixes #59643
- Fixes #55084
- Fixes #60417