FSI Watcher not displaying anything

### Describe the bug

I can't get FSI Watcher to connect or display anything present in the integrated terminal's FSI session.

### Steps to reproduce

1. Open any folder
2. Command `FSI: Start`
3. Command `FSI: Open Watcher`
4. Bind some variables. E.g., `let x = 1;;`

### Expected behaviour

I think i expect the bound values to be presented in the Watcher editor window

### Screenshots


## Machine info
- OS: Windows
- .NET SDK version: 8.0.105
- Ionide version: 7.20.1

Reproduce the issue by running `FSI: Start`, then `FSI: Open Watcher`, and evaluating `let x = 1;;` in the integrated FSI session. Trace the FSI Watcher integration from those commands; the work is done when bound values appear in the Watcher editor window.

Written by the indexing model from the issue text.