feat(package-rules): set skipStage (#30264)

lib/config/types.ts

lib/types/skip-reason.ts

lib/util/package-rules/index.spec.ts

lib/util/package-rules/index.ts

lib/workers/repository/process/fetch.ts

lib/workers/repository/process/lookup/filter-checks.ts

lib/workers/repository/process/lookup/index.ts

lib/workers/repository/updates/flatten.ts