windows: Add support for SSH (#29145)

Closes #19892

This PR builds on top of #20587 and improves upon it.

Release Notes:

- N/A

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/extension_host/src/headless_host.rs

@@ -1,7 +1,10 @@
 use std::{path::PathBuf, sync::Arc};
 
 use anyhow::{Context as _, Result};
-use client::{TypedEnvelope, proto};
+use client::{
+    TypedEnvelope,
+    proto::{self, FromProto},
+};
 use collections::{HashMap, HashSet};
 use extension::{
     Extension, ExtensionDebugAdapterProviderProxy, ExtensionHostProxy, ExtensionLanguageProxy,
@@ -328,7 +331,7 @@ impl HeadlessExtensionStore {
                         version: extension.version,
                         dev: extension.dev,
                     },
-                    PathBuf::from(envelope.payload.tmp_dir),
+                    PathBuf::from_proto(envelope.payload.tmp_dir),
                     cx,
                 )
             })?