Make Buffer::apply_ops infallible (#18089)

This PR makes the `Buffer::apply_ops` method infallible for
`text::Buffer` and `language::Buffer`.

We discovered that `text::Buffer::apply_ops` was only fallible due to
`apply_undo`, which didn't actually need to be fallible.

Release Notes:

- N/A

crates/channel/src/channel_buffer.rs

@@ -66,7 +66,7 @@ impl ChannelBuffer {
             let capability = channel_store.read(cx).channel_capability(channel.id);
             language::Buffer::remote(buffer_id, response.replica_id as u16, capability, base_text)
         })?;
-        buffer.update(&mut cx, |buffer, cx| buffer.apply_ops(operations, cx))??;
+        buffer.update(&mut cx, |buffer, cx| buffer.apply_ops(operations, cx))?;
 
         let subscription = client.subscribe_to_entity(channel.id.0)?;
 
@@ -151,7 +151,7 @@ impl ChannelBuffer {
             cx.notify();
             this.buffer
                 .update(cx, |buffer, cx| buffer.apply_ops(ops, cx))
-        })??;
+        })?;
 
         Ok(())
     }

crates/channel/src/channel_store.rs

@@ -1007,7 +1007,7 @@ impl ChannelStore {
                                                 .into_iter()
                                                 .map(language::proto::deserialize_operation)
                                                 .collect::<Result<Vec<_>>>()?;
-                                        buffer.apply_ops(incoming_operations, cx)?;
+                                        buffer.apply_ops(incoming_operations, cx);
                                         anyhow::Ok(outgoing_operations)
                                     })
                                     .log_err();