Mark identifiers used in format strings as used

[fenollp]

Eg.

tx.try_send(Ok(res.clone())).map_err(|e|{
    error!("An error occurred while sending event to peer {e}");
}).is_ok()

today, warnalyzer complains:

unused Parameter 'e'

---

Versions used:

• https://github.com/est31/warnalyzer/commit/64c0c30a925e8ce0c27f2683aaca073d184d7fdc
• https://pkg.go.dev/github.com/sourcegraph/scip@v0.4.0/cmd/scip

  # rustc -Vv
  rustc 1.81.0 (eeb90cda1 2024-09-04)
  binary: rustc
  commit-hash: eeb90cda1969383f56a2637cbd3037bdf598841c
  commit-date: 2024-09-04
  host: x86_64-unknown-linux-gnu
  release: 1.81.0
  LLVM version: 18.1.7