global lsp settings should fail when using a relative path

[hferreiro]

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Describe the bug / provide steps to reproduce it

If a relative path is added to lsp.clangd.binary.path setting, Zed won't complain, but it can fail unexpectedly. In my case, I had closed a project where the path didn't exist while the other open Zed windows where for projects where the relative path was available, but I've got an error because the working directory was picked from the project last closed.

Environment

Zed: v0.165.4 (Zed)
OS: macOS 15.1.1
Memory: 32 GiB
Architecture: aarch64

If applicable, add screenshots or screencasts of the incorrect state / behavior

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If applicable, attach your Zed.log file to this issue.

Zed.log