debugger: Remove fake adapter and un-gate GDB (#27557)

This is a clean-up PR in anticipation of introduction of Debugger
Registry. I wanna get rid of DebugAdapterKind (or rather, it being an
enum).
Release Notes:

- N/A

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Anthony <anthony@zed.dev>

crates/remote_server/Cargo.toml

@@ -28,6 +28,7 @@ backtrace = "0.3"
 chrono.workspace = true
 clap.workspace = true
 client.workspace = true
+dap.workspace = true
 env_logger.workspace = true
 extension.workspace = true
 extension_host.workspace = true
@@ -69,6 +70,7 @@ libc.workspace = true
 [dev-dependencies]
 client = { workspace = true, features = ["test-support"] }
 clock = { workspace = true, features = ["test-support"] }
+dap = { workspace = true, features = ["test-support"] }
 fs = { workspace = true, features = ["test-support"] }
 gpui = { workspace = true, features = ["test-support"] }
 http_client = { workspace = true, features = ["test-support"] }

crates/remote_server/src/headless_project.rs

@@ -1,5 +1,6 @@
 use ::proto::{FromProto, ToProto};
 use anyhow::{anyhow, Result};
+use dap::DapRegistry;
 use extension::ExtensionHostProxy;
 use extension_host::headless_host::HeadlessExtensionStore;
 use fs::Fs;
@@ -52,6 +53,7 @@ pub struct HeadlessAppState {
     pub http_client: Arc<dyn HttpClient>,
     pub node_runtime: NodeRuntime,
     pub languages: Arc<LanguageRegistry>,
+    pub debug_adapters: Arc<DapRegistry>,
     pub extension_host_proxy: Arc<ExtensionHostProxy>,
 }
 
@@ -69,6 +71,7 @@ impl HeadlessProject {
             http_client,
             node_runtime,
             languages,
+            debug_adapters,
             extension_host_proxy: proxy,
         }: HeadlessAppState,
         cx: &mut Context<Self>,
@@ -108,6 +111,7 @@ impl HeadlessProject {
                 node_runtime.clone(),
                 fs.clone(),
                 languages.clone(),
+                debug_adapters.clone(),
                 environment.clone(),
                 toolchain_store.read(cx).as_language_toolchain_store(),
                 breakpoint_store.clone(),

crates/remote_server/src/remote_editing_tests.rs

@@ -4,6 +4,7 @@
 use crate::headless_project::HeadlessProject;
 use client::{Client, UserStore};
 use clock::FakeSystemClock;
+use dap::DapRegistry;
 use extension::ExtensionHostProxy;
 use fs::{FakeFs, Fs};
 use gpui::{AppContext as _, Entity, SemanticVersion, TestAppContext};
@@ -1445,6 +1446,7 @@ pub async fn init_test(
     let http_client = Arc::new(BlockedHttpClient);
     let node_runtime = NodeRuntime::unavailable();
     let languages = Arc::new(LanguageRegistry::new(cx.executor()));
+    let debug_adapters = DapRegistry::default().into();
     let proxy = Arc::new(ExtensionHostProxy::new());
     server_cx.update(HeadlessProject::init);
     let headless = server_cx.new(|cx| {
@@ -1457,6 +1459,7 @@ pub async fn init_test(
                 http_client,
                 node_runtime,
                 languages,
+                debug_adapters,
                 extension_host_proxy: proxy,
             },
             cx,

crates/remote_server/src/unix.rs

@@ -3,6 +3,7 @@ use crate::HeadlessProject;
 use anyhow::{anyhow, Context as _, Result};
 use chrono::Utc;
 use client::{telemetry, ProxySettings};
+use dap::DapRegistry;
 use extension::ExtensionHostProxy;
 use fs::{Fs, RealFs};
 use futures::channel::mpsc;
@@ -471,6 +472,7 @@ pub fn execute_run(
             let mut languages = LanguageRegistry::new(cx.background_executor().clone());
             languages.set_language_server_download_dir(paths::languages_dir().clone());
             let languages = Arc::new(languages);
+            let debug_adapters = DapRegistry::default().into();
 
             HeadlessProject::new(
                 HeadlessAppState {
@@ -479,6 +481,7 @@ pub fn execute_run(
                     http_client,
                     node_runtime,
                     languages,
+                    debug_adapters,
                     extension_host_proxy,
                 },
                 cx,