Intent of TestInsert_Single

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
  - common/ 1 test
    
    persistence/ 1 test
    
    tests/ 1 test
    
    TestPGXSP/ 1 test
    
    TestPostgreSQLHistoryExecutionBufferSuite/ 1 test
    
    go.temporal.io/server/common/persistence/tests/TestPGXSP/TestPostgreSQLHistoryExecutionBufferSuite/TestInsert_Single Introduced here