Bug 1959801 - Remove remove_dir_all r=supply-chain-reviewers,gfx-reviewers,ErichDonGubler

As far as I can tell, this code does not rely on the slight differences provided by the `remove_dir_all` crate that make it different than `std::fs::remove_dir_all`, but #gfx-reviewers should please confirm that.

Differential Revision: https://phabricator.services.mozilla.com/D245133

Cargo.lock

@@ -5661,15 +5661,6 @@ dependencies = [
  "viaduct",
 ]
 
-[[package]]
-name = "remove_dir_all"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "replace_with"
 version = "0.1.7"
@@ -7556,7 +7547,6 @@ dependencies = [
  "num_cpus",
  "objc",
  "rayon",
- "remove_dir_all",
  "static_prefs",
  "swgl",
  "thin-vec",