[code] logging to track reconnection cause

[akosyakov]

What it does

• It adds logging to determine a cause of web socket closing.
• It also changes the default websocket in VS Code Web:
  • by default VS Code will try to reconnect the websocket only if it was not closed cleanly (1000 code)
  • in our case it is better to reconnect always when workspace phase is running regardless of websocket close code
• fix code frontend fails to load sometimes #4448: makes sure that grpc-web is loaded before the local app

Changes in Gitpod Code: microsoft/vscode@e2eb3ee...a6ceaaf

How to test

• Start a workspace.
• Run WebSocket.disconnectWorkspace and check web sockets are reconnected within a minute.
• Throttle network on system level, like with Edge profile, and see that web sockets still get connected and reconnected.

[JanKoehnlein]

LGTM