Use Fx* variants of HashMap and HashSet everywhere in Zed (#7481)

Release Notes:

- N/A

crates/util/Cargo.toml

@@ -15,6 +15,7 @@ test-support = ["tempfile", "git2"]
 [dependencies]
 anyhow.workspace = true
 backtrace = "0.3"
+collections.workspace = true
 dirs = "3.0"
 futures.workspace = true
 git2 = { workspace = true, optional = true }

crates/util/src/test/marked_text.rs

@@ -1,4 +1,5 @@
-use std::{cmp::Ordering, collections::HashMap, ops::Range};
+use collections::HashMap;
+use std::{cmp::Ordering, ops::Range};
 
 /// Construct a string and a list of offsets within that string using a single
 /// string containing embedded position markers.