[Response Ops] Migrate rules_list and rule_details FTR specs to Scout

Migrates two "Hard" tier specs from the FTR → Scout backlog
(x-pack/platform/test/functional_with_es_ssl/apps/rules/):

- rules/rules_list/rules_list.ts (26 tests) → rules_list.spec.ts
  21 tests migrated; 5 skipped (need test.failing/test.always-firing)

- rules/details.ts (20 tests) → 3 separate files (scout_max_one_describe):
  • rule_details_header.spec.ts (8 tests – disable/snooze/re-enable flow)
  • rule_details_edit.spec.ts (2 tests – edit flyout / cancel with confirm)
  • rule_details_so_navigation.spec.ts (2 tests – SO management nav)
  6 tests skipped (need preconfigured connectors or always-firing rule type)

Rule type substitutions: test.noop / test.always-firing → .es-query;
test.failing → test.skip. FTR preconfigured connectors replaced with
dynamically-created .server-log / .slack connectors where possible.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: guskovaue