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

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

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Release Notes:

- N/A

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

crates/buffer_diff/Cargo.toml

@@ -39,5 +39,5 @@ text = { workspace = true, features = ["test-support"] }
 unindent.workspace = true
 zlog.workspace = true
 
-[package.metadata.cargo-machete]
+[package.metadata.cargo-shear]
 ignored = ["tracing"]