debugger: Add args argument to debugger launch config (#27953)

This also fixes a bug where debug cargo test code actions would debug
all tests in a mod instead of a specific test

Release Notes:

- N/A

crates/project/src/debugger/session.rs

@@ -225,6 +225,7 @@ impl LocalMode {
                         DebugRequestType::Launch(task::LaunchConfig {
                             program: "".to_owned(),
                             cwd: None,
+                            args: Default::default(),
                         })
                     }
                     dap::StartDebuggingRequestArgumentsRequest::Attach => {