Enable clippy::clone_on_copy (#8728)

This PR enables the
[`clippy::clone_on_copy`](https://rust-lang.github.io/rust-clippy/master/index.html#/clone_on_copy)
rule and fixes the outstanding violations.

Release Notes:

- N/A

tooling/xtask/src/main.rs

@@ -84,7 +84,6 @@ fn run_clippy(args: ClippyArgs) -> Result<()> {
         "clippy::borrow_deref_ref",
         "clippy::borrowed_box",
         "clippy::cast_abs_to_unsigned",
-        "clippy::clone_on_copy",
         "clippy::cmp_owned",
         "clippy::crate_in_macro_def",
         "clippy::default_constructed_unit_structs",