refactor(support): complete toIntIds() rollout in tenant-area code

Final pass over tenant repositories and TenantScopeService, collapsing
the remaining two-line intval+filter and one-line intval+unique patterns
onto the shared `toIntIds()` helper. The inline pattern is now gone
from the codebase.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/Repository/Tenant/TenantMicrosoftAuthRepository.php

@@ -29,8 +29,7 @@ class TenantMicrosoftAuthRepository implements TenantMicrosoftAuthRepositoryInte
 
     public function listByTenantIds(array $tenantIds): array
     {
-        $tenantIds = array_values(array_unique(array_map('intval', $tenantIds)));
-        $tenantIds = array_values(array_filter($tenantIds, static fn ($id) => $id > 0));
+        $tenantIds = toIntIds($tenantIds);
         if (!$tenantIds) {
             return [];
         }