[gha] consolidate artifact downloaders in prep to delete dup in diem/actions
[gha] consolidate artifact downloaders in prep to delete dup in diem/actions

Closes: #8539

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