fix(core): Consolidate ownership and sharing data on workflows and credentials (#7920)

## Summary

Ensure `ownedBy` and `sharedWith` are present and uniform for
credentials and workflows.

Details in story: https://linear.app/n8n/issue/PAY-987

packages/cli/test/integration/workflows.controller.test.ts

@@ -211,7 +211,13 @@ describe('GET /workflows', () => {
 					updatedAt: any(String),
 					tags: [{ id: any(String), name: 'A' }],
 					versionId: any(String),
-					ownedBy: { id: owner.id },
+					ownedBy: {
+						id: owner.id,
+						email: any(String),
+						firstName: any(String),
+						lastName: any(String),
+					},
+					sharedWith: [],
 				}),
 				objectContaining({
 					id: any(String),
@@ -221,7 +227,13 @@ describe('GET /workflows', () => {
 					updatedAt: any(String),
 					tags: [],
 					versionId: any(String),
-					ownedBy: { id: owner.id },
+					ownedBy: {
+						id: owner.id,
+						email: any(String),
+						firstName: any(String),
+						lastName: any(String),
+					},
+					sharedWith: [],
 				}),
 			]),
 		});
@@ -231,7 +243,7 @@ describe('GET /workflows', () => {
 		);
 
 		expect(found.nodes).toBeUndefined();
-		expect(found.sharedWith).toBeUndefined();
+		expect(found.sharedWith).toHaveLength(0);
 		expect(found.usedCredentials).toBeUndefined();
 	});
 
@@ -412,8 +424,26 @@ describe('GET /workflows', () => {
 			expect(response.body).toEqual({
 				count: 2,
 				data: arrayContaining([
-					{ id: any(String), ownedBy: { id: owner.id } },
-					{ id: any(String), ownedBy: { id: owner.id } },
+					{
+						id: any(String),
+						ownedBy: {
+							id: owner.id,
+							email: any(String),
+							firstName: any(String),
+							lastName: any(String),
+						},
+						sharedWith: [],
+					},
+					{
+						id: any(String),
+						ownedBy: {
+							id: owner.id,
+							email: any(String),
+							firstName: any(String),
+							lastName: any(String),
+						},
+						sharedWith: [],
+					},
 				]),
 			});
 		});

packages/cli/test/unit/services/ownership.service.test.ts

@@ -15,6 +15,7 @@ import {
 	randomInteger,
 	randomName,
 } from '../../integration/shared/random';
+import { WorkflowEntity } from '@/databases/entities/WorkflowEntity';
 
 const wfOwnerRole = () =>
 	Object.assign(new Role(), {
@@ -94,7 +95,7 @@ describe('OwnershipService', () => {
 	});
 
 	describe('addOwnedByAndSharedWith()', () => {
-		test('should add ownedBy and sharedWith to credential', async () => {
+		test('should add `ownedBy` and `sharedWith` to credential', async () => {
 			const owner = mockUser();
 			const editor = mockUser();
 
@@ -124,6 +125,36 @@ describe('OwnershipService', () => {
 			]);
 		});
 
+		test('should add `ownedBy` and `sharedWith` to workflow', async () => {
+			const owner = mockUser();
+			const editor = mockUser();
+
+			const workflow = new WorkflowEntity();
+
+			workflow.shared = [
+				{ role: mockCredRole('owner'), user: owner },
+				{ role: mockCredRole('editor'), user: editor },
+			] as SharedWorkflow[];
+
+			const { ownedBy, sharedWith } = ownershipService.addOwnedByAndSharedWith(workflow);
+
+			expect(ownedBy).toStrictEqual({
+				id: owner.id,
+				email: owner.email,
+				firstName: owner.firstName,
+				lastName: owner.lastName,
+			});
+
+			expect(sharedWith).toStrictEqual([
+				{
+					id: editor.id,
+					email: editor.email,
+					firstName: editor.firstName,
+					lastName: editor.lastName,
+				},
+			]);
+		});
+
 		test('should produce an empty sharedWith if no sharee', async () => {
 			const owner = mockUser();