Fix findMany test in accoundIdm service.

apps/server/src/modules/account/domain/services/account-idm.service.ts

@@ -174,7 +174,7 @@ export class AccountServiceIdm extends AbstractAccountService {
 
 	// eslint-disable-next-line @typescript-eslint/require-await, @typescript-eslint/no-unused-vars
 	public findMany(_offset: number, _limit: number): Promise<Account[]> {
-		throw new NotImplementedException();
+		return Promise.reject(new NotImplementedException());
 	}
 
 	private async getOptionalIdmAccount(accountId: string): Promise<string | undefined> {