Add `rustic-test-failure` to `compilation-error-regexp-alist`

[neosimsim]

Add regexp to compilation-error-regexp-alist to match test failures for rustic-cargo-test-mode. This make test output like

---- fail stdout ----
thread 'fail' panicked at src/main.rs:20:5:
assertion `left == right` failed
  left: 1
 right: 2

navigatable.

Closes #573