Intent of Get_with_nil_value_and_nil_node

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
    
    TestFieldSuite/ 1 test
    
    TestFieldGetSimple/ 1 test
    
    go.temporal.io/server/chasm/TestFieldSuite/TestFieldGetSimple/Get_with_nil_value_and_nil_node Introduced here