Fix for extension search crash (revert #22524; revert #22525) (#22543)

Revert "Improve fuzzy match performance and fix corner case that omits
results (#22524)"
This reverts commit 6ef5d8f748.

Revert "Check cancel in multithreaded fuzzy matching (#22525)"
This reverts commit 51ac2d3667.

Fuzzy matching implemented in:
- https://github.com/zed-industries/zed/pull/22524
- https://github.com/zed-industries/zed/pull/22525

Caused a panic in the extension store search:
- Closes: https://github.com/zed-industries/zed/issues/22541

cc: @mgsloan 

Release Notes:

- N/A

crates/util/src/util.rs

@@ -8,6 +8,7 @@ pub mod test;
 
 use anyhow::{anyhow, Context as _, Result};
 use futures::Future;
+
 use itertools::Either;
 use regex::Regex;
 use std::sync::{LazyLock, OnceLock};
@@ -110,27 +111,6 @@ where
     }
 }
 
-pub fn truncate_to_bottom_n_sorted_by<T, F>(items: &mut Vec<T>, limit: usize, compare: &F)
-where
-    F: Fn(&T, &T) -> Ordering,
-{
-    if limit == 0 {
-        items.truncate(0);
-    }
-    if items.len() < limit {
-        return;
-    }
-    // When limit is near to items.len() it may be more efficient to sort the whole list and
-    // truncate, rather than always doing selection first as is done below. It's hard to analyze
-    // where the threshold for this should be since the quickselect style algorithm used by
-    // `select_nth_unstable_by` makes the prefix partially sorted, and so its work is not wasted -
-    // the expected number of comparisons needed by `sort_by` is less than it is for some arbitrary
-    // unsorted input.
-    items.select_nth_unstable_by(limit, compare);
-    items.truncate(limit);
-    items.sort_by(compare);
-}
-
 #[cfg(unix)]
 pub fn load_shell_from_passwd() -> Result<()> {
     let buflen = match unsafe { libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) } {