cfs: Restore download progress for update and switch

Closes: #2316

composefs switched to having a progress API instead of writing
progress directly to the tty itself; we need to wire it up
now to our progress infrastructure.

Assisted-by: AI
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

crates/lib/src/bootc_composefs/mod.rs

@@ -5,6 +5,7 @@ pub(crate) mod digest;
 pub(crate) mod export;
 pub(crate) mod finalize;
 pub(crate) mod gc;
+pub(crate) mod progress;
 pub(crate) mod repo;
 pub(crate) mod rollback;
 pub(crate) mod selinux;