check-ci: multiple improvements

[cataphract]

• List bridge jobs alongside regular jobs so failed triggers like deploy_to_reliability_env show up in --list-jobs output
• paginated_get reads X-Total-Pages from the first response and fetches all remaining pages in parallel instead of sequentially (~3x speedup on paginated endpoints)
• get_child_pipelines fetches sibling children in parallel
• Merge success/failure/counter passes over all_jobs into one loop
• api_get now returns headers as a third tuple element
• Remove dead 401/403 re-check in discover_pipeline
• Remove .replace("Z", "+00:00") workaround (Python 3.11+ handles Z)
• Fix any -> Any type annotation
• Bridge/trigger jobs and regular jobs with allow_failure: true are now counted in allow_fail= on the status line instead of failed=, and no FAILED: line is printed for them. fetch_all_jobs now also fetches bridge jobs so their allow_failure flag is visible.
• show pipeline name (from bridge job) and job IDs in --list-jobs output
• merge pipeline/job/bridge discovery into one pass (discover_pipelines_and_jobs) eliminating double bridge fetches and separate fetch_pipeline_statuses calls
• fix compute_duration to use GitLab's duration field (not created_at queue time)
• replace sys.exit() in api_get/discover_pipeline with GitLabError exception
• open success.txt/failure.txt once per poll cycle instead of per job
• warn when paginated_get receives a non-list response
• remove unused allow_fail_count

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.68% (-0.01%)

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