pull,package_info,ui,cli: report the pull flow via BuildView

Retire the ProgressCallback option-of-closure, the one pre-port
reporting idiom left in the tree: pull and package_info::lookup now
take &dyn BuildView like every other core flow, and the announcements
map onto message (unsized work), progress (item counts: series probes,
git objects, extraction) and progress again for byte downloads, which
the old callback carried in the same 4-argument shape.

The terminal side swaps the (ProgressBar, closure) pair for PullView, a
BuildView implementation owning one bar of the shared MultiProgress
with the same spinner/transfer style switching; it releases the line on
drop, which the CLI triggers explicitly on both outcomes since
exit(1) skips destructors. Headless callers (tests, internal lookups)
pass &report::Quiet. git clone sideband parsing is skipped entirely
when the view is not enabled, matching the old None-callback shortcut.

src/build/mod.rs

@@ -2284,13 +2284,13 @@ Provides: virtual-thing (= 2.0), plain-virtual
                 Some(dist),
                 None,
                 None,
-                None,
+                &crate::report::Quiet,
             ))
             .unwrap_or_else(|e| panic!("package lookup failed for {}: {}", package, e));
         rt.block_on(crate::pull::pull(
             &package_info,
             Some(fetch_dir.path()),
-            None,
+            &crate::report::Quiet,
             true,
         ))
         .unwrap_or_else(|e| panic!("pull failed for {}: {}", package, e));