debugger: Show language icons in debug scenario picker (#30662)

We attempt to resolve the language name in this order

1. Based on debug adapter if they're for a singular language e.g. Delve
2. File extension if it exists
3. If a language name exists within a debug scenario's label

In the future I want to use locators to also determine the language as
well and refresh scenario list when a new scenario has been saved

Release Notes:

- N/A

crates/dap/src/adapters.rs

@@ -8,7 +8,7 @@ pub use dap_types::{StartDebuggingRequestArguments, StartDebuggingRequestArgumen
 use futures::io::BufReader;
 use gpui::{AsyncApp, SharedString};
 pub use http_client::{HttpClient, github::latest_github_release};
-use language::LanguageToolchainStore;
+use language::{LanguageName, LanguageToolchainStore};
 use node_runtime::NodeRuntime;
 use serde::{Deserialize, Serialize};
 use settings::WorktreeId;
@@ -418,6 +418,11 @@ pub trait DebugAdapter: 'static + Send + Sync {
         user_installed_path: Option<PathBuf>,
         cx: &mut AsyncApp,
     ) -> Result<DebugAdapterBinary>;
+
+    /// Returns the language name of an adapter if it only supports one language
+    fn adapter_language_name(&self) -> Option<LanguageName> {
+        None
+    }
 }
 
 #[cfg(any(test, feature = "test-support"))]

crates/dap/src/registry.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use async_trait::async_trait;
 use collections::FxHashMap;
 use gpui::{App, Global, SharedString};
+use language::LanguageName;
 use parking_lot::RwLock;
 use task::{DebugRequest, DebugScenario, SpawnInTerminal, TaskTemplate};
 
@@ -59,6 +60,11 @@ impl DapRegistry {
         );
     }
 
+    pub fn adapter_language(&self, adapter_name: &str) -> Option<LanguageName> {
+        self.adapter(adapter_name)
+            .and_then(|adapter| adapter.adapter_language_name())
+    }
+
     pub fn add_locator(&self, locator: Arc<dyn DapLocator>) {
         let _previous_value = self.0.write().locators.insert(locator.name(), locator);
         debug_assert!(