Duplicate hints, popups, and processes opening project + standalone files

I’ve got a weird issue where hints, popups, etc. get duplicated. See for example this screenshot, where I have not one, but _two_ lovely hovers showing the type of the symbol I’ve moused over, as well as duplicated suggestions above the imports to list their imported symbols explicitly:

This was pretty baffling to me until I noticed that I’ve got not one, but two lovely `haskell-language-server-wrapper` & `haskell-language-server-8.10.2` processes running 😄

I’ve only got the one workspace open (and nothing else using hls), and the process group indicates that they were indeed launched by VS Code:

If I kill one of them, it gets relaunched, but relaunching VS Code generally gets it back down to one. I’ve had mixed results with this, however, and with reloading the window; when I first noticed this, it was spawning double processes on reload/relaunch too, and eventually I had to close all the panes in one editor group, close the editor group, and relaunch VS Code before it resolved and I could open the editor group and keep going with only a single set of processes. But eventually it happened again; unfortunately, I don’t know why.

I am using ghc 8.10.2 and the following HLS version, both installed via ghcup:

```
❱ haskell-language-server-8.10.2 --version
haskell-language-server version: 0.4.0.0 (GHC: 8.10.2) (PATH: /Users/rob/.ghcup/bin/haskell-language-server-8.10.2~0.4.0) (GIT hash: 0a18edde24923251a148cbbc0ae993a6aac83b9c)
```

I have v1.1.0 of this VS Code extension, v3.3.0 of the Haskell syntax extension, and have been using Version: 1.49.2 of VS Code itself, although it tells me there is an update so I will install it presently.