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/UtilityService.ts

@@ -98,7 +98,7 @@ export class UtilityService {
 			try {
 				// TODO: RE2インスタンスをキャッシュ
 				return new RE2(regexp[1], regexp[2]).test(text);
-			} catch (err) {
+			} catch (_) {
 				// This should never happen due to input sanitisation.
 				return false;
 			}