Intent of no_soft_assert_leaves_cluster_clean

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
  - tests/ 1 test
    
    testcore/ 1 test
    
    TestSharedClusterPoison/ 1 test
    
    go.temporal.io/server/tests/testcore/TestSharedClusterPoison/no_soft_assert_leaves_cluster_clean Introduced here