fix(iroh-blobs): Remove debugging logs & more cleanup (#2690)

## Description

More stuff to clean up I came across while trying to debug an issue.
Also, this makes it so that errors from `iroh_blobs::get::db::get_blob`
that happen *before* the `get_conn` step get printed.
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changes. -->

## Breaking Changes

None.
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including how to migrate older code. -->

## Notes & open questions

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I decided to just remove the tracing logs in `downloader/progress.rs`.
They never really helped us surface the bug, they mostly polluted the
logs, to be honest.
The only thing they surfaced was that we didn't properly clean up
`TransferState::progress_id_to_blob` when there's an error in
`iroh_blobs::get::db::get_blob` that causes us to not send the
`DownloadProgress::Done` event.

## Change checklist

- [x] Self-review.
- ~~[ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.~~
- ~~[ ] Tests if relevant.~~
- [x] All breaking changes documented.

Author: matheus23

iroh-blobs/src/downloader.rs

@@ -717,7 +717,6 @@ impl<G: Getter<Connection = D::Connection>, D: Dialer> Service<G, D> {
                 entry.get_mut().intents.insert(intent_id, intent_handlers);
             }
             hash_map::Entry::Vacant(entry) => {
-                tracing::warn!("is new, queue");
                 let progress_sender = self.progress_tracker.track(
                     kind,
                     intent_handlers
@@ -728,7 +727,9 @@ impl<G: Getter<Connection = D::Connection>, D: Dialer> Service<G, D> {
                 );
 
                 let get_state = match self.getter.get(kind, progress_sender.clone()).await {
-                    Err(_err) => {
+                    Err(err) => {
+                        // This prints a "FailureAction" which is somewhat weird, but that's all we get here.
+                        tracing::error!(?err, "failed queuing new download");
                         self.finalize_download(
                             kind,
                             [(intent_id, intent_handlers)].into(),

iroh-blobs/src/downloader/progress.rs

@@ -103,7 +103,6 @@ struct Inner {
 
 impl Inner {
     fn subscribe(&mut self, subscriber: ProgressSubscriber) -> DownloadProgress {
-        tracing::warn!(state=?self.state, "subscribe! emit initial");
         let msg = DownloadProgress::InitialState(self.state.clone());
         self.subscribers.push(subscriber);
         msg
@@ -137,9 +136,7 @@ impl ProgressSender for BroadcastProgressSender {
         // making sure that the lock is not held across an await point.
         let futs = {
             let mut inner = self.shared.lock();
-            tracing::trace!(?msg, state_pre = ?inner.state, "send to {}", inner.subscribers.len());
             inner.on_progress(msg.clone());
-            tracing::trace!(state_post = ?inner.state, "send");
             let futs = inner
                 .subscribers
                 .iter_mut()

iroh-blobs/src/get/db.rs

@@ -663,7 +663,7 @@ pub enum DownloadProgress {
         /// The offset of the progress, in bytes.
         offset: u64,
     },
-    /// We are done with `id`, and the hash is `hash`.
+    /// We are done with `id`.
     Done {
         /// The unique id of the entry.
         id: u64,

iroh-blobs/src/get/progress.rs

@@ -180,7 +180,7 @@ impl TransferState {
                     warn!(%id, "Received `Done` event for unknown progress id.")
                 }
             }
-            _ => {}
+            DownloadProgress::AllDone(_) | DownloadProgress::Abort(_) => {}
         }
     }
 }