build: sort coreutils entries at build time

[Xylphy]

Resolves #10811

Removes runtime sorting of coreutils utilities and shifts the ordering work into build.rs.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/unexpand/bounded-memory. tests/unexpand/bounded-memory is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/shuf/shuf-reservoir (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/sort/sort-stale-thread-mem (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/pr/bounded-memory is no longer failing!

[ChrisDryden]

Seems like a great change, the only thing I'm thinking is that it might be a good idea to add a regression test since its not immediately clear from the runtime implementation that its relying on build time behavior, maybe something similar to this just in case someone makes changes in this file:

  #[test]
  fn test_list_is_sorted() {
      let result = new_ucmd!().arg("--list").succeeds();
      let lines: Vec<&str> = result.stdout_str().lines().collect();
      let mut sorted = lines.clone();
      sorted.sort_unstable();
      assert_eq!(lines, sorted);
  }

But then again unfortunately we don't have a coreutils integration test file yet.

[ChrisDryden]

I created an issue for the missing integration test setup for this utility: #10829

I think we should be okay with merging this for now