VS: code related to updating statusbar is defunct

[majocha]

The code displaying info in status bar is commented out:

fsharp/vsintegration/src/FSharp.Editor/Navigation/GoToDefinition.fs

Line 111 in 1bb1c3c

// TODO: Uncomment code when VS has a fix for updating the status bar.

Let's investigate what to do with it.
It could be best to remove it for now, so there is less useless passing around of IVSStatusBar and fewer requests to the old COM IServiceProvider in editor code. Maybe removing it would help with refactoring of GoToDefinition.fs, which currently stands at more than 1k lines of code 🤯.

Related: #15000, #14995.