Switch from cargo-machete to cargo-shear (#62643)

This results in ~110 crates being removed, and some orphaned files also.

---

Release Notes:

- N/A

Signed-off-by: Neel <neel@zed.dev>

script/clippy

@@ -11,8 +11,8 @@ set -x
 
 # If local, run other checks if we have the tools installed.
 if [[ -z "${GITHUB_ACTIONS+x}" ]]; then
-    which cargo-machete >/dev/null 2>&1 || exit 0
-    cargo machete
+    which cargo-shear >/dev/null 2>&1 || exit 0
+    cargo shear --locked --deny-warnings
 
     which typos >/dev/null 2>&1 || exit 0
     typos --config typos.toml