minor: Tweak some verbose LSP logs

The info log within `process_request_response` duplicated the body of
the JSON message printed earlier by the transport which was confusing.

The error log in the completion handler was easy to hit during normal
use and is not actually an error - dropping is the graceful way to
handle changes occurring while completion requests are in flight.

helix-lsp/src/transport.rs

@@ -223,10 +223,7 @@ impl Transport {
         language_server_name: &str,
     ) -> Result<()> {
         let (id, result) = match output {
-            jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => {
-                info!("{language_server_name} <- {}", result);
-                (id, Ok(result))
-            }
+            jsonrpc::Output::Success(jsonrpc::Success { id, result, .. }) => (id, Ok(result)),
             jsonrpc::Output::Failure(jsonrpc::Failure { id, error, .. }) => {
                 error!("{language_server_name} <- {error}");
                 (id, Err(error.into()))

helix-term/src/handlers/completion.rs

@@ -57,7 +57,7 @@ async fn replace_completions(
                 return;
             };
             if handle.is_canceled() {
-                log::error!("dropping outdated completion response");
+                log::info!("dropping outdated completion response");
                 return;
             }