Intent of a_=_'foo', a_!=_'foo'

All 4 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 4 tests
- server/ 4 tests
  - common/ 4 tests
    
    persistence/ 4 tests
    
    visibility/ 4 tests
    
    store/ 4 tests
    
    sql/ 4 tests
    
    TestSQLQueryConverter_ConvertComparisonExpr/ 2 tests
    
    go.temporal.io/server/common/persistence/visibility/store/sql/TestSQLQueryConverter_ConvertComparisonExpr/a_!=_'foo' Introduced here
    
    go.temporal.io/server/common/persistence/visibility/store/sql/TestSQLQueryConverter_ConvertComparisonExpr/a_=_'foo' Introduced here
    
    TestSQLQueryConverter_ConvertKeywordComparisonExpr/ 2 tests
    
    go.temporal.io/server/common/persistence/visibility/store/sql/TestSQLQueryConverter_ConvertKeywordComparisonExpr/a_!=_'foo' Inherited a_=_'foo', a_!=_'foo'
    
    go.temporal.io/server/common/persistence/visibility/store/sql/TestSQLQueryConverter_ConvertKeywordComparisonExpr/a_=_'foo' Inherited a_=_'foo', a_!=_'foo'