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/middlewares/listQuery/select.ts

@@ -1,46 +1,34 @@
-import { handleListQueryError } from './error';
-import { jsonParse } from 'n8n-workflow';
-import { WorkflowSchema } from './workflow.schema';
-import * as utils from '@/utils';
-import type { ListQueryRequest } from '@/requests';
+/* eslint-disable @typescript-eslint/naming-convention */
+
+import { WorkflowSelect } from './dtos/workflow.select.dto';
+import * as ResponseHelper from '@/ResponseHelper';
+import { toError } from '@/utils';
+
 import type { RequestHandler } from 'express';
-import type { Schema } from '@/middlewares/listQuery/schema';
+import type { ListQuery } from '@/requests';
 
-function toQuerySelect(rawSelect: string, schema: typeof Schema) {
-	const asArr = jsonParse(rawSelect, { errorMessage: 'Failed to parse select JSON' });
-
-	if (!utils.isStringArray(asArr)) {
-		throw new Error('Parsed select is not a string array');
-	}
-
-	return asArr.reduce<Record<string, true>>((acc, field) => {
-		if (!schema.fieldNames.includes(field)) return acc;
-		return (acc[field] = true), acc;
-	}, {});
-}
-
-export const selectListQueryMiddleware: RequestHandler = (req: ListQueryRequest, res, next) => {
+export const selectListQueryMiddleware: RequestHandler = (req: ListQuery.Request, res, next) => {
 	const { select: rawSelect } = req.query;
 
 	if (!rawSelect) return next();
 
-	let schema;
+	let Select;
 
 	if (req.baseUrl.endsWith('workflows')) {
-		schema = WorkflowSchema;
+		Select = WorkflowSelect;
 	} else {
 		return next();
 	}
 
 	try {
-		const select = toQuerySelect(rawSelect, schema);
+		const select = Select.fromString(rawSelect);
 
 		if (Object.keys(select).length === 0) return next();
 
 		req.listQueryOptions = { ...req.listQueryOptions, select };
 
 		next();
-	} catch (error) {
-		handleListQueryError('select', rawSelect, error);
+	} catch (maybeError) {
+		ResponseHelper.sendErrorResponse(res, toError(maybeError));
 	}
 };