report,ui: name the tee log by flow kind

BuildTarget::source_only carried two states for what is a three-way
distinction now that pkh test exists: replace it with a TargetKind
(Source/Binary/Test) and derive the tee log prefix (build-/deb-/test-)
from it, so test runs get their own log family instead of borrowing
the deb one.

src/put/mod.rs

@@ -94,7 +94,7 @@ async fn put_impl(opts: &PutOptions<'_>) -> Result<(), Box<dyn std::error::Error
             "Uploading {} {} to {}",
             changes.source, changes.version, target.label
         ),
-        source_only: false,
+        kind: crate::report::TargetKind::Binary,
         // An upload runs no subprocess: nothing to tee
         tee_log: false,
     });