feat(constants): Pull Request Status Constants (#5158)

lib/constants/pull-requests.ts

lib/platform/azure/azure-helper.ts

lib/platform/azure/index.ts

lib/platform/bitbucket-server/index.ts

lib/platform/bitbucket-server/utils.ts

lib/platform/bitbucket/index.ts

lib/platform/bitbucket/utils.ts

lib/platform/gitea/gitea-helper.ts

lib/platform/gitea/index.ts

lib/platform/github/index.ts

lib/platform/gitlab/index.ts

lib/workers/branch/check-existing.ts

lib/workers/branch/index.ts

lib/workers/repository/error-config.ts

lib/workers/repository/finalise/prune.ts

lib/workers/repository/finalise/validate.ts

lib/workers/repository/master-issue.ts

lib/workers/repository/onboarding/branch/check.ts

test/platform/bitbucket-server/index.spec.ts

test/platform/gitea/gitea-helper.spec.ts