debugger: Fix issues with launch.json handling (#32563)

After this PR we can run all the in-tree launch.json examples from [this
repo](https://github.com/microsoft/vscode-recipes).

Things done:

- Fill in default cwd at a lower level for all adapters
- Update launch.json parsing for DebugScenario changes
- Imitate how VS Code normalizes the `type` field for JS debug tasks
- Make version field optional
- Extend the variable replacer a bit

Release Notes:

- Debugger Beta: fixed issues preventing loading and running of debug
tasks from VS Code's launch.json.

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/dap_adapters/src/ruby.rs

@@ -174,6 +174,13 @@ impl DebugAdapter for RubyDebugAdapter {
 
         arguments.extend(ruby_config.args);
 
+        let mut configuration = definition.config.clone();
+        if let Some(configuration) = configuration.as_object_mut() {
+            configuration
+                .entry("cwd")
+                .or_insert_with(|| delegate.worktree_root_path().to_string_lossy().into());
+        }
+
         Ok(DebugAdapterBinary {
             command: Some(rdbg_path.to_string_lossy().to_string()),
             arguments,
@@ -190,7 +197,7 @@ impl DebugAdapter for RubyDebugAdapter {
             envs: ruby_config.env.into_iter().collect(),
             request_args: StartDebuggingRequestArguments {
                 request: self.request_kind(&definition.config)?,
-                configuration: definition.config.clone(),
+                configuration,
             },
         })
     }