Resolve "Rename the `Master` role to `Maintainer`" Backend

...ervices/users/refresh_authorized_projects_service_spec.rb

...pport/features/issuable_slash_commands_shared_examples.rb

spec/support/helpers/markdown_feature.rb

spec/support/import_export/export_file_helper.rb

spec/support/matchers/access_matchers_for_controller.rb

...issuable_create_service_slash_commands_shared_examples.rb

...mples/features/creatable_merge_request_shared_examples.rb

...amples/features/editable_merge_request_shared_examples.rb

...features/master_manages_access_requests_shared_example.rb

...d_examples/models/members_notifications_shared_example.rb

spec/views/projects/imports/new.html.haml_spec.rb

...s/pipeline_schedules/_pipeline_schedule.html.haml_spec.rb

spec/views/shared/notes/_form.html.haml_spec.rb

spec/workers/merge_worker_spec.rb

spec/workers/pipeline_schedule_worker_spec.rb