Intent of scavenger.go ×7

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
    
    worker/ 4 tests
    
    scanner/ 4 tests
    
    history/ 4 tests
    
    TestScavengerTestSuite/ 4 tests
    
    go.temporal.io/server/service/worker/scanner/history/TestScavengerTestSuite/TestDeleteWorkflowAfterRetention Inherited scavenger.go ×5
    
    go.temporal.io/server/service/worker/scanner/history/TestScavengerTestSuite/TestDeletingBranchesTwoPages Inherited scavenger.go ×5
    
    go.temporal.io/server/service/worker/scanner/history/TestScavengerTestSuite/TestMixesTwoPages Inherited scavenger.go ×3
    
    go.temporal.io/server/service/worker/scanner/history/TestScavengerTestSuite/TestNoGarbageTwoPages Inherited request_response.pb.go ×1