Intent of TestAcquireShardSuccess, TestAcquireShardsConcurrently

All 6 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 6 tests
- server/ 6 tests
  - service/ 6 tests
    
    history/ 6 tests
    
    shard/ 6 tests
    
    TestShardControllerSuite/ 6 tests
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestAcquireShardSuccess Introduced here
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestAcquireShardsConcurrently Introduced here
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestReadiness_Blocked Inherited TestReadiness_Blocked
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestReadiness_Error Inherited TestReadiness_Error
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestReadiness_MembershipChanged Inherited TestReadiness_MembershipChanged
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestShardCounter Inherited controller_impl.go ×3