Allow remote loading for DAP-only extensions (#33981)

Closes #ISSUE


![image](https://github.com/user-attachments/assets/8e1766e4-5d89-4263-875d-ad0dff5c55c2)


Release Notes:

- Allow remote loading for DAP-only extensions

crates/extension/src/extension_manifest.rs

@@ -130,6 +130,12 @@ impl ExtensionManifest {
 
         Ok(())
     }
+
+    pub fn allow_remote_load(&self) -> bool {
+        !self.language_servers.is_empty()
+            || !self.debug_adapters.is_empty()
+            || !self.debug_locators.is_empty()
+    }
 }
 
 pub fn build_debug_adapter_schema_path(