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/server/api/endpoints/i/update.ts

@@ -323,7 +323,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 					try {
 						new RE2(regexp[1], regexp[2]);
-					} catch (err) {
+					} catch (_) {
 						throw new ApiError(meta.errors.invalidRegexp);
 					}
 				}
@@ -587,7 +587,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					})
 					.execute();
 			}
-		} catch (err) {
+		} catch (_) {
 			// なにもしない
 		}
 	}