[cluster-test] Retry ECR::describe_images
[cluster-test] Retry ECR::describe_images

We call it more often now and need retry to handle transient AWS failures

Closes: #1765
Approved by: ankushagarwal

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