Debugger: Add stop on entry support to debug adapter configs (#27942)

This PR adds passing in `stop_on_entry` to debug configs in debug.json
instead of going through initialization args.

This has two benefits:

1. It's more streamlined to a user since every internal adapter supports
`stop_on_entry` for launch requests and Go's adapter supports it for
attach requests too.
2. It will allow @osiewicz `NewSesssionModal` PR to use this field for
the stop on entry checkbox.

Release Notes:

- N/A

crates/languages/src/rust.rs

@@ -637,6 +637,7 @@ impl ContextProvider for RustContextProvider {
                     locator: Some("cargo".into()),
                     tcp_connection: None,
                     initialize_args: None,
+                    stop_on_entry: None,
                 }),
                 command: "cargo".into(),
                 args: vec![
@@ -737,6 +738,7 @@ impl ContextProvider for RustContextProvider {
                     initialize_args: None,
                     locator: Some("cargo".into()),
                     tcp_connection: None,
+                    stop_on_entry: None,
                 }),
                 args: debug_task_args,
                 tags: vec!["rust-main".to_owned()],