debugger: More tidy up for SSH (#28993)

Split `locator` out of DebugTaskDefinition to make it clearer when
location needs to happen.

Release Notes:

- N/A

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Cole Miller <m@cole-miller.net>

crates/dap/src/registry.rs

@@ -1,3 +1,4 @@
+use gpui::{App, Global};
 use parking_lot::RwLock;
 
 use crate::adapters::{DebugAdapter, DebugAdapterName};
@@ -11,8 +12,20 @@ struct DapRegistryState {
 #[derive(Clone, Default)]
 /// Stores available debug adapters.
 pub struct DapRegistry(Arc<RwLock<DapRegistryState>>);
+impl Global for DapRegistry {}
 
 impl DapRegistry {
+    pub fn global(cx: &mut App) -> &mut Self {
+        let ret = cx.default_global::<Self>();
+
+        #[cfg(any(test, feature = "test-support"))]
+        if ret.adapter(crate::FakeAdapter::ADAPTER_NAME).is_none() {
+            ret.add_adapter(Arc::new(crate::FakeAdapter::new()));
+        }
+
+        ret
+    }
+
     pub fn add_adapter(&self, adapter: Arc<dyn DebugAdapter>) {
         let name = adapter.name();
         let _previous_value = self.0.write().adapters.insert(name, adapter);
@@ -21,19 +34,12 @@ impl DapRegistry {
             "Attempted to insert a new debug adapter when one is already registered"
         );
     }
+
     pub fn adapter(&self, name: &str) -> Option<Arc<dyn DebugAdapter>> {
         self.0.read().adapters.get(name).cloned()
     }
+
     pub fn enumerate_adapters(&self) -> Vec<DebugAdapterName> {
         self.0.read().adapters.keys().cloned().collect()
     }
-
-    #[cfg(any(test, feature = "test-support"))]
-    pub fn fake() -> Self {
-        use crate::FakeAdapter;
-
-        let register = Self::default();
-        register.add_adapter(Arc::new(FakeAdapter::new()));
-        register
-    }
 }