tenant_migration_multi_writes.js is a stress test that runs a ton of writes during tenant migrations, and it's possible for the donor's oplog to get truncated out from under the recipient's oplog fetcher. If this happens, the migration will abort before hitting abortTenantMigrationBeforeLeavingBlockingState and so we'll time out waiting to hit this failpoint. We can use the --oplogMinRetentionHours storage option to prevent the oplog from being truncated.