Intent of with_current_version, useRampingVersion_with_no_ramping_version_falls_back_to_current

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 2 tests
- server/ 2 tests
  - common/ 2 tests
    
    worker_versioning/ 2 tests
    
    TestFindDeploymentVersionForWorkflowID/ 2 tests
    
    go.temporal.io/server/common/worker_versioning/TestFindDeploymentVersionForWorkflowID/useRampingVersion_with_no_ramping_version_falls_back_to_current Introduced here
    
    go.temporal.io/server/common/worker_versioning/TestFindDeploymentVersionForWorkflowID/with_current_version Introduced here