Being offline can disable HLS

If HLS happens to start when you're offline, it (or ghcup ?) fails, and the Haskell extension gives up on it permanently, with Restart Haskell LSP Server having no effect. You have to do Reload Window to fix it.

Start by reproducing the failure by starting HLS while offline, then compare the behavior of Restart Haskell LSP Server with Reload Window. Trace whether the Haskell extension or ghcup permanently gives up after the failed startup; done means restarting the Haskell LSP server recovers HLS without requiring Reload Window.

Written by the indexing model from the issue text.