GitHub Importer: Enhance logging around API calls to GitHub
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As seen in #341974 it would be beneficial to log info about API calls before we make them in case the far end(GitHub) times out or throws a different exception through octokit.
See [this suggestion](https://gitlab.com/gitlab-org/gitlab/-/issues/341974#note_696529977) about `github_identifiers` as a possible thing to augment areas like [this](https://gitlab.com/gitlab-org/gitlab/blob/228e7ddd3fbae04bfb17c85ec3893c239b9e7f36/lib/gitlab/github_import/importer/pull_requests_merged_by_importer.rb#L39-39) with(any line before we reach out to GitHub's octokit that calls an API would be helpful).
Related to #341974.
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