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 }