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

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

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