Intent of empty_IndexedFields, nil_search_attributes

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
  - chasm/ 2 tests
    
    lib/ 2 tests
    
    scheduler/ 2 tests
    
    migration/ 2 tests
    
    TestLegacyToCreateFromMigrationStateRequest_StripsSystemSearchAttributes/ 2 tests
    
    go.temporal.io/server/chasm/lib/scheduler/migration/TestLegacyToCreateFromMigrationStateRequest_StripsSystemSearchAttributes/empty_IndexedFields Introduced here
    
    go.temporal.io/server/chasm/lib/scheduler/migration/TestLegacyToCreateFromMigrationStateRequest_StripsSystemSearchAttributes/nil_search_attributes Introduced here
  - service/ 2 tests
    
    worker/ 2 tests
    
    scheduler/ 2 tests
    
    TestWorkflow/ 2 tests
    
    go.temporal.io/server/service/worker/scheduler/TestWorkflow/TestMigrateDynamicConfig Inherited TestMigrateDynamicConfig
    
    go.temporal.io/server/service/worker/scheduler/TestWorkflow/TestMigrateDynamicConfigFailure Inherited TestMigrateDynamicConfigFailure