feat(gastown): add PR-fixup workflow instructions to polecat and mayor prompts#1996

jrf0110 merged 2 commits intogastown-stagingKilo-Org/cloud:gastown-stagingfrom

convoy/feat-skip-review-queue-for-gt-pr-fixup-b/d3064e2b/headKilo-Org/cloud:convoy/feat-skip-review-queue-for-gt-pr-fixup-b/d3064e2b/headCopy head branch name to clipboard