Tidy up DAP initialization (#28730)

To make DAP work over SSH we want to create the binary
at the project level (so we can wrap it in an `ssh` invocation
transparently).

This means not pushing the adapter down into the session, and resolving
more information ahead-of-time.

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

Release Notes:

- N/A

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Piotr <piotr@zed.dev>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Anthony <anthony@zed.dev>

crates/project/src/project_tests.rs

@@ -39,7 +39,7 @@ use std::{env, mem, num::NonZeroU32, ops::Range, str::FromStr, sync::OnceLock, t
 use task::{ResolvedTask, TaskContext};
 use unindent::Unindent as _;
 use util::{
-    TryFutureExt as _, assert_set_eq, path,
+    TryFutureExt as _, assert_set_eq, maybe, path,
     paths::PathMatcher,
     separator,
     test::{TempTree, marked_text_offsets},