[e2e tests] limit concurrency level for faster execution (#4920)
[e2e tests] limit concurrency level for faster execution (#4920)


aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core