refactor(core): Make workflow services injectable (no-changelog) (#8033)

Refactor static workflow service classes into DI-compatible classes

Context: https://n8nio.slack.com/archives/C069HS026UF/p1702466571648889

Up next:
- Inject dependencies into workflow services
- Consolidate workflow controllers into one
- Make workflow controller injectable
- Inject dependencies into workflow controller

---------

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

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

@@ -20,6 +20,8 @@ import { getCredentialOwnerRole, getGlobalMemberRole, getGlobalOwnerRole } from
 import { createUser } from './shared/db/users';
 import { createWorkflow, getWorkflowSharing, shareWorkflowWithUsers } from './shared/db/workflows';
 import type { Role } from '@/databases/entities/Role';
+import { EnterpriseWorkflowService } from '@/workflows/workflow.service.ee';
+import { WorkflowService } from '@/workflows/workflow.service';
 
 let globalMemberRole: Role;
 let owner: User;
@@ -55,6 +57,9 @@ beforeAll(async () => {
 	saveCredential = affixRoleToSaveCredential(credentialOwnerRole);
 
 	await utils.initNodeTypes();
+
+	Container.set(WorkflowService, new WorkflowService());
+	Container.set(EnterpriseWorkflowService, new EnterpriseWorkflowService());
 });
 
 beforeEach(async () => {