Intent of valid_request, wait_stage_-_normalizes_UNSPECIFIED_to_CLOSED

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
  - chasm/ 2 tests
    
    lib/ 2 tests
    
    nexusoperation/ 2 tests
    
    TestValidatePollNexusOperationExecutionRequest/ 2 tests
    
    go.temporal.io/server/chasm/lib/nexusoperation/TestValidatePollNexusOperationExecutionRequest/valid_request Introduced here
    
    go.temporal.io/server/chasm/lib/nexusoperation/TestValidatePollNexusOperationExecutionRequest/wait_stage_-_normalizes_UNSPECIFIED_to_CLOSED Introduced here