Support relative paths in LSP & DAP binaries (#42135)

Closes #41214

Release Notes:

- Added support for relative paths in LSP and DAP binaries

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

crates/project/src/debugger/dap_store.rs

@@ -261,7 +261,10 @@ impl DapStore {
                     .get(&adapter.name());
                 let user_installed_path = dap_settings.and_then(|s| match &s.binary {
                     DapBinary::Default => None,
-                    DapBinary::Custom(binary) => Some(PathBuf::from(binary)),
+                    DapBinary::Custom(binary) => {
+                        // if `binary` is absolute, `.join()` will keep it unmodified
+                        Some(worktree.read(cx).abs_path().join(PathBuf::from(binary)))
+                    }
                 });
                 let user_args = dap_settings.map(|s| s.args.clone());
                 let user_env = dap_settings.map(|s| s.env.clone());