feat: add ignoreReviewers config option (#19776)

docs/usage/configuration-options.md

docs/usage/key-concepts/automerge.md

lib/config/options/index.ts

lib/config/types.ts

lib/modules/platform/azure/__snapshots__/index.spec.ts.snap

lib/modules/platform/azure/index.spec.ts

lib/modules/platform/azure/index.ts

...latform/bitbucket-server/__snapshots__/index.spec.ts.snap

lib/modules/platform/bitbucket-server/index.ts

...dules/platform/bitbucket/__snapshots__/index.spec.ts.snap

lib/modules/platform/bitbucket/index.spec.ts

lib/modules/platform/bitbucket/index.ts

lib/modules/platform/github/common.ts

lib/modules/platform/github/index.spec.ts

lib/modules/platform/gitlab/__snapshots__/index.spec.ts.snap

lib/modules/platform/gitlab/index.spec.ts

lib/modules/platform/gitlab/index.ts

lib/modules/platform/types.ts

lib/workers/repository/update/pr/index.spec.ts

lib/workers/repository/update/pr/index.ts