debugger: Run build in terminal (#29645)

Currently contains the pre-work of making sessions creatable without a
definition, but still need to change the spawn in terminal
to use the running session

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

crates/task/src/lib.rs

@@ -20,7 +20,8 @@ pub use debug_format::{
 };
 pub use task_template::{
     DebugArgsRequest, HideStrategy, RevealStrategy, TaskTemplate, TaskTemplates,
-    substitute_all_template_variables_in_str,
+    substitute_all_template_variables_in_str, substitute_variables_in_map,
+    substitute_variables_in_str,
 };
 pub use vscode_debug_format::VsCodeDebugTaskFile;
 pub use vscode_format::VsCodeTaskFile;