- only use annotations for `opoo` and `onoe` if
`HOMEBREW_GITHUB_ACTIONS` is set. This will make using `brew` less
noisy in GitHub Actions for third parties. See
Homebrew/discussions#5602.
- if we've already called `puts_annotation_if_env_set`, then we no
longer need to print the message to `$stderr`. The message from the
annotation already show up in the GitHub Actions log, so printing to
`$stderr` just leads to duplicate messages in the log.
While we're here, let's make sure to forward the `file:` and `line:`
kwargs of `puts_annotation_if_env_set` to the `Annotation` constructor.
c6e2cd9037