Fork CI reconciler: count a workflow added by a PR as project CI only if its jobs did work #74905

The fork CI reconciler (AIP-120, #74822) decides that a project CI run "bypassed the gate" when the base branch's copy of the run's workflow is not triggered by the run's event. A workflow the pull request adds therefore always counts, even if all of its jobs were skipped in apache/airflow (for example a fork-only workflow guarded by if: github.repository != 'apache/airflow'). If the pull request also changes .github/workflows/, which adding the file does, it is closed for gate tampering although no project CI work ran.

Proposed: for workflows the base branch does not trigger, list the run's jobs as is already done for long ci-amd.yml runs, and count the run only if a job ran. Keep failing closed when the job list cannot be read.

Code: BypassFinder._did_run_project_ci in dev/breeze/src/airflow_breeze/utils/fork_ci_reconcile.py.

Drafted-by: Claude Code (Opus 5); reviewed by @potiuk before posting