Intent of TestCanMerge

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
  - service/ 4 tests
    
    history/ 4 tests
    
    queues/ 4 tests
    
    TestIteratorSuite/ 1 test
    
    go.temporal.io/server/service/history/queues/TestIteratorSuite/TestCanMerge Inherited TestCanMerge
    
    TestRangeSuite/ 1 test
    
    go.temporal.io/server/service/history/queues/TestRangeSuite/TestCanMerge Introduced here
    
    TestScopeSuite/ 1 test
    
    go.temporal.io/server/service/history/queues/TestScopeSuite/TestCanMergeByRange Inherited TestCanMergeByRange
    
    TestSliceSuite/ 1 test
    
    go.temporal.io/server/service/history/queues/TestSliceSuite/TestCanMergeWithSlice Inherited TestCanMergeWithSlice