enable and fix no-unused-vars and no-async-promise-executor (#17070)

* dev: set --no-bail for lint task

* lint: enable no-async-promise-executor lint and fix them

* lint: enable no-unused-vars with allowing _ prefix

* lint: fix semi

packages/backend/src/core/RoleService.ts

@@ -314,7 +314,7 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 				default:
 					return false;
 			}
-		} catch (err) {
+		} catch (_) {
 			// TODO: log error
 			return false;
 		}