ci: Remove unnecessary async/await, enable await-thenable linting rule (no-changelog) (#8076)

## Summary
We accidentally made some functions `async` in
https://github.com/n8n-io/n8n/pull/7846
This PR reverts that change. 

## Review / Merge checklist
- [x] PR title and summary are descriptive.

packages/workflow/test/RoutingNode.test.ts

@@ -706,7 +706,7 @@ describe('RoutingNode', () => {
 					mode,
 				);
 
-				const result = await routingNode.getRequestOptionsFromParameters(
+				const result = routingNode.getRequestOptionsFromParameters(
 					executeSingleFunctions,
 					testData.input.nodeTypeProperties,
 					itemIndex,