fix(stack): surface fetch_old_pr_heads failures instead of swallowing#1315

mergify[bot] merged 2 commits intomainMergifyio/mergify-cli:mainfrom

devs/jd/fix/stack-revision-history-fetch-resilience/surface-fetch-old-pr-heads-failures-instead--d33459eaMergifyio/mergify-cli:devs/jd/fix/stack-revision-history-fetch-resilience/surface-fetch-old-pr-heads-failures-instead--d33459eaCopy head branch name to clipboard