[rafayqayyum]

Fixes #993.

Commit#refresh_statuses! still only fetched one page of 100 statuses, the hotfix from #989. GitHub's statuses endpoint returns every status event, not just the latest per context, so a commit with ~50 contexts (pending + success each) already exceeds a page and the rest were dropped.

This follows last_response.rels[:next] through handle_github_redirections, the same approach as paginated_check_runs. One difference: it reads the next link before storing a page's statuses, so a GitHub call made while storing them (e.g. from a hook) can't replace last_response and stop pagination early.

Tests: a two-page test modelled on the check runs one, the existing statuses test now stubs last_response, and the merge request refresh test expects last_response twice since statuses read it too. CHANGELOG entry added under Unreleased.

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