backport: bitcoin/bitcoin#26905, #27724, #28482, partial #29659 - clang-tidy [perf] - #7693

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target