Optimize import of workflow definitions

When multiple versions of the same workflow definitions are being imported a call is made per imported version for the latest version and published version of that workflow definition. We should be able to reduce this to a single call for all versions.

Trace the workflow-definition import path and identify where calls are made for each imported version's latest and published definitions. Compare the current call pattern with the desired single call covering all versions, then add or update tests that verify equivalent imports require only one call.

Written by the indexing model from the issue text.