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/test/integration/shared/testDb.ts

@@ -35,7 +35,7 @@ import type { ExecutionData } from '@db/entities/ExecutionData';
 import { generateNanoId } from '@db/utils/generators';
 import { RoleService } from '@/services/role.service';
 import { VariablesService } from '@/environments/variables/variables.service';
-import { TagRepository } from '@/databases/repositories';
+import { TagRepository, WorkflowTagMappingRepository } from '@/databases/repositories';
 import { separate } from '@/utils';
 
 export type TestDBType = 'postgres' | 'mysql';
@@ -119,6 +119,7 @@ export async function truncate(collections: CollectionName[]) {
 
 	if (tag) {
 		await Container.get(TagRepository).delete({});
+		await Container.get(WorkflowTagMappingRepository).delete({});
 	}
 
 	for (const collection of rest) {
@@ -389,14 +390,24 @@ export async function createWaitingExecution(workflow: WorkflowEntity) {
 //          Tags
 // ----------------------------------
 
-export async function createTag(attributes: Partial<TagEntity> = {}) {
+export async function createTag(attributes: Partial<TagEntity> = {}, workflow?: WorkflowEntity) {
 	const { name } = attributes;
 
-	return Container.get(TagRepository).save({
+	const tag = await Container.get(TagRepository).save({
 		id: generateNanoId(),
 		name: name ?? randomName(),
 		...attributes,
 	});
+
+	if (workflow) {
+		const mappingRepository = Container.get(WorkflowTagMappingRepository);
+
+		const mapping = mappingRepository.create({ tagId: tag.id, workflowId: workflow.id });
+
+		await mappingRepository.save(mapping);
+	}
+
+	return tag;
 }
 
 // ----------------------------------