Intent of ExecutePureTask_with_no_state_mutations_still_cleans_up_the_executed_task

All 1 exact test in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 1 test
- server/ 1 test
  - chasm/ 1 test
    
    TestNodeSuite/ 1 test
    
    TestCloseTransaction_TaskValidationSubtreeDirty/ 1 test
    
    go.temporal.io/server/chasm/TestNodeSuite/TestCloseTransaction_TaskValidationSubtreeDirty/ExecutePureTask_with_no_state_mutations_still_cleans_up_the_executed_task Introduced here