refactor: Consolidate WorkflowService.getMany() (no-changelog) (#6892)

In scope:

- Consolidate `WorkflowService.getMany()`.
- Support non-entity field `ownedBy` for `select`.
- Support `tags` for `filter`.
- Move `addOwnerId` to `OwnershipService`.
- Remove unneeded check for `filter.id`.
- Simplify DTO validation for `filter` and `select`.
- Expand tests for `GET /workflows`.

Workflow list query DTOs:

```
filter → name, active, tags
select → id, name, active, tags, createdAt, updatedAt, versionId, ownedBy
```

Out of scope:

- Migrate `shared_workflow.roleId` and `shared_credential.roleId` to
string IDs.
- Refactor `WorkflowHelpers.getSharedWorkflowIds()`.

packages/cli/src/services/ownership.service.ts

@@ -3,6 +3,8 @@ import { CacheService } from './cache.service';
 import { SharedWorkflowRepository, UserRepository } from '@/databases/repositories';
 import type { User } from '@/databases/entities/User';
 import { RoleService } from './role.service';
+import type { ListQuery } from '@/requests';
+import type { Role } from '@/databases/entities/Role';
 
 @Service()
 export class OwnershipService {
@@ -34,4 +36,17 @@ export class OwnershipService {
 
 		return sharedWorkflow.user;
 	}
+
+	addOwnedBy(
+		workflow: ListQuery.Workflow.WithSharing,
+		workflowOwnerRole: Role,
+	): ListQuery.Workflow.WithOwnership {
+		const { shared, ...rest } = workflow;
+
+		const ownerId = shared?.find((s) => s.roleId.toString() === workflowOwnerRole.id)?.userId;
+
+		return Object.assign(rest, {
+			ownedBy: ownerId ? { id: ownerId } : null,
+		});
+	}
 }