Intent of link_converter.go ×2

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 3 tests
- server/ 3 tests
  - common/ 3 tests
    
    nexus/ 3 tests
    
    TestConvertNexusLinkToLinkWorkflowEvent/ 3 tests
    
    go.temporal.io/server/common/nexus/TestConvertNexusLinkToLinkWorkflowEvent/valid_request_id_empty Introduced here
    
    go.temporal.io/server/common/nexus/TestConvertNexusLinkToLinkWorkflowEvent/valid_request_id_long_event_type Introduced here
    
    go.temporal.io/server/common/nexus/TestConvertNexusLinkToLinkWorkflowEvent/valid_request_id_short_event_type Introduced here