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/src/WebhookHelpers.ts

@@ -60,7 +60,7 @@ import type { WorkflowEntity } from '@db/entities/WorkflowEntity';
 import { EventsService } from '@/services/events.service';
 import { OwnershipService } from './services/ownership.service';
 import { parseBody } from './middlewares';
-import { WorkflowsService } from './workflows/workflows.services';
+import { WorkflowService } from './workflows/workflow.service';
 import { Logger } from './Logger';
 import { NotFoundError } from './errors/response-errors/not-found.error';
 import { InternalServerError } from './errors/response-errors/internal-server.error';
@@ -387,7 +387,7 @@ export async function executeWebhook(
 		}
 
 		// Save static data if it changed
-		await WorkflowsService.saveStaticData(workflow);
+		await Container.get(WorkflowService).saveStaticData(workflow);
 
 		const additionalKeys: IWorkflowDataProxyAdditionalKeys = {
 			$executionId: executionId,