[Bug]: compiler installed under VSCode folder will be used before the global one when LSP is starting without workspace opened

[RodgeFu]

Describe the bug

If user installs compiler under vscode's folder (...\Programs\Microsoft VS Code\node_modules@typespec\compiler...) and our extension is activated without any workspace, the compiler under vscode folder will be used before the one installed compiler.

Reproduction

1. install compiler under vscode folder and global
2. activate our extension by command or opened tsp file
3. check the compiler used by lsp

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[mzhongl524]

can not repro