Shrink cross-db spec allowlist

Final shrinkage of spec allowlist, the rest arises from specs somehow,
with the exception of package specs which is known.

spec/support/database/cross-join-allowlist.yml

-- "./ee/spec/features/merge_trains/two_merge_requests_on_train_spec.rb"
-- "./ee/spec/features/merge_trains/user_adds_merge_request_to_merge_train_spec.rb"
 - "./ee/spec/finders/ee/namespaces/projects_finder_spec.rb"
 - "./ee/spec/graphql/ee/resolvers/namespace_projects_resolver_spec.rb"
-- "./ee/spec/models/ci/minutes/project_monthly_usage_spec.rb"
 - "./ee/spec/models/project_spec.rb"
-- "./ee/spec/models/security/finding_spec.rb"
-- "./ee/spec/models/security/scan_spec.rb"
 - "./ee/spec/requests/api/ci/minutes_spec.rb"
-- "./ee/spec/requests/api/graphql/ci/minutes/usage_spec.rb"
 - "./ee/spec/services/ci/minutes/additional_packs/change_namespace_service_spec.rb"
 - "./ee/spec/services/ci/minutes/additional_packs/create_service_spec.rb"
 - "./ee/spec/services/ci/minutes/refresh_cached_data_service_spec.rb"
-- "./spec/controllers/groups/settings/ci_cd_controller_spec.rb"
-- "./spec/controllers/projects/settings/ci_cd_controller_spec.rb"
 - "./spec/features/groups/packages_spec.rb"
-- "./spec/features/ide/user_opens_merge_request_spec.rb"
-- "./spec/features/merge_request/user_sees_merge_request_pipelines_spec.rb"
 - "./spec/features/projects/infrastructure_registry_spec.rb"
 - "./spec/features/projects/packages_spec.rb"
 - "./spec/finders/ci/pipelines_for_merge_request_finder_spec.rb"
-- "./spec/graphql/resolvers/ci/group_runners_resolver_spec.rb"
 - "./spec/lib/api/entities/package_spec.rb"
 - "./spec/lib/gitlab/background_migration/copy_ci_builds_columns_to_security_scans_spec.rb"
 - "./spec/lib/gitlab/background_migration/migrate_pages_metadata_spec.rb"
@@ -27,14 +16,8 @@
 - "./spec/migrations/associate_existing_dast_builds_with_variables_spec.rb"
 - "./spec/migrations/disable_job_token_scope_when_unused_spec.rb"
 - "./spec/migrations/schedule_copy_ci_builds_columns_to_security_scans2_spec.rb"
-- "./spec/migrations/schedule_pages_metadata_migration_spec.rb"
-- "./spec/models/ci/pipeline_spec.rb"
 - "./spec/models/ci/runner_spec.rb"
-- "./spec/models/merge_request_spec.rb"
-- "./spec/models/user_spec.rb"
 - "./spec/presenters/packages/detail/package_presenter_spec.rb"
-- "./spec/requests/api/ci/runner/runners_post_spec.rb"
-- "./spec/requests/api/graphql/ci/runner_spec.rb"
 - "./spec/requests/api/graphql/group/packages_spec.rb"
 - "./spec/requests/api/graphql/packages/composer_spec.rb"
 - "./spec/requests/api/graphql/packages/conan_spec.rb"