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/cli/src/CredentialsHelper.ts

@@ -579,7 +579,7 @@ export class CredentialsHelper extends ICredentialsHelper {
 					credentialType,
 					'internal' as WorkflowExecuteMode,
 					undefined,
-					await user.hasGlobalScope('externalSecret:use'),
+					user.hasGlobalScope('externalSecret:use'),
 				);
 			} catch (error) {
 				this.logger.debug('Credential test failed', error);