Intent of scale_manager.go ×7

All 7 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 7 tests
- server/ 7 tests
  - service/ 7 tests
    
    matching/ 7 tests
    
    TestScaleManagerSuite/ 7 tests
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestBacklogCountUpdateInMemoryOnly Inherited TestBacklogCountUpdateInMemoryOnly
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestDrainClearsBacklogBits Inherited TestDrainClearsBacklogBits
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestDrainShrinkLimitedReadWrite Inherited TestDrainShrinkLimitedReadWrite
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestDrainSkippedDuringBufferTime Inherited TestDrainSkippedDuringBufferTime
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestNoDrainWithBacklog Inherited TestNoDrainWithBacklog
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestNoWriteWhenBacklogUnchanged Inherited TestNoWriteWhenBacklogUnchanged
    
    go.temporal.io/server/service/matching/TestScaleManagerSuite/TestShadowModeSkipsDrain Inherited TestShadowModeSkipsDrain