Fix RSpec/BeEmpty offenses

.rubocop_todo/rspec/be_empty.yml

spec/graphql/resolvers/board_list_issues_resolver_spec.rb

...graphql/resolvers/ci/inherited_variables_resolver_spec.rb

...aphql/resolvers/group_environment_scopes_resolver_spec.rb

spec/models/concerns/has_user_type_spec.rb

spec/models/environment_spec.rb

spec/models/integrations/harbor_spec.rb

spec/models/ml/candidate_spec.rb

spec/models/namespace_spec.rb

spec/models/repository_spec.rb

spec/models/users/credit_card_validation_spec.rb

spec/presenters/blob_presenter_spec.rb

spec/requests/api/ci/runners_spec.rb

spec/requests/api/graphql/jobs_query_spec.rb

spec/requests/api/graphql/project/release_spec.rb

spec/requests/api/groups_spec.rb

spec/services/merge_requests/update_service_spec.rb

spec/services/search_service_spec.rb

spec/support/shared_examples/lib/menus_shared_examples.rb

spec/tooling/lib/tooling/gettext_extractor_spec.rb