Currently we just create temp dirs like `/tmp/ghcup-XXXX`, put the symlinks there and add that to PATH before running the requested command. This may clutter `/tmp` when ghcup is used as e.g. a wrapper script for `ghc`. A predictable name would be something like `/tmp/ghcup-ghc-8.10.7_hls-1.6.0.0_cabal-3.6.2.0`. We need to make sure to resolve tags (like `latest`) before creating such path. https://github.com/haskell/vscode-haskell/issues/540