debugger: Use current worktree directory when spawning an adapter (#31054)

/cc @osiewicz 

I think bringing this back should fix **bloveless** his issue with go
debugger.
This is also nice, so people are not forced to give us a working
directory, because most adapters will use their **cwd** as the project
root directory. For JavaScript, you don't need to specify the **cwd**
anymore because it can already infer it

Release Notes:

- debugger beta: Fixed some adapters fail to determine the right root level of the
debug program.

crates/dap_adapters/src/php.rs

@@ -89,7 +89,7 @@ impl PhpDebugAdapter {
                 host,
                 timeout,
             }),
-            cwd: None,
+            cwd: Some(delegate.worktree_root_path().to_path_buf()),
             envs: HashMap::default(),
             request_args: StartDebuggingRequestArguments {
                 configuration: task_definition.config.clone(),