Remove smol as a dependency from a bunch of crates (#53603)

We aren't making use of it in these crates and it unblocks some
web-related work

Release Notes:

- N/A or Added/Fixed/Improved ...

crates/multi_buffer/src/multi_buffer.rs

@@ -16,6 +16,7 @@ use buffer_diff::{
 };
 use clock::ReplicaId;
 use collections::{BTreeMap, Bound, HashMap, HashSet, IndexSet};
+use futures_lite::future::yield_now;
 use gpui::{App, Context, Entity, EventEmitter};
 use itertools::Itertools;
 use language::{
@@ -33,7 +34,6 @@ use gpui::AppContext as _;
 use rope::DimensionPair;
 use settings::Settings;
 use smallvec::SmallVec;
-use smol::future::yield_now;
 use std::{
     any::type_name,
     borrow::Cow,