Add latest changes from gitlab-org/gitlab@master

.gitlab/lint/unused_helper_methods/excluded_methods.yml

.rubocop_todo/layout/line_length.yml

CHANGELOG.md

...ts/merge_request_dashboard/components/config_dropdown.vue

...ts/vue_merge_request_widget/components/checks/message.vue

...ts/vue_shared/components/groups_list/groups_list_item.vue

...rapid_diffs/viewers/text/line_content_component.html.haml

app/graphql/graphql_triggers.rb

app/graphql/mutations/base_mutation.rb

app/graphql/mutations/integrations/exclusions/create.rb

app/graphql/subscriptions/ci/jobs/status_updated.rb

app/graphql/types/subscription_type.rb

app/models/ci/build.rb

app/models/issue.rb

app/models/merge_request.rb

app/models/users/callout.rb

app/models/work_item.rb

app/services/snippets/count_service.rb

...eature_flags/gitlab_com_derisk/ci_job_status_realtime.yml

config/feature_flags/wip/extensible_reference_filters.yml