Migrate saga mappings to MapSaga().ToMessage() API (#844)

* Initial plan

* Update saga mappings to use MapSaga().ToMessage() syntax

Co-authored-by: danielmarbach <174258+danielmarbach@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: danielmarbach <174258+danielmarbach@users.noreply.github.com>

Author: Copilot

src/NServiceBus.Storage.MongoDB.AcceptanceTests/When_custom_provider_registered.cs

@@ -50,7 +50,7 @@ public Task Handle(StartSaga1 message, IMessageHandlerContext context)
                 return Task.CompletedTask;
             }
 
-            protected override void ConfigureHowToFindSaga(SagaPropertyMapper<JustASagaData> mapper) => mapper.ConfigureMapping<StartSaga1>(m => m.DataId).ToSaga(s => s.DataId);
+            protected override void ConfigureHowToFindSaga(SagaPropertyMapper<JustASagaData> mapper) => mapper.MapSaga(s => s.DataId).ToMessage<StartSaga1>(m => m.DataId);
         }
 
         public class CustomProvider(Context testContext) : IMongoClientProvider

src/NServiceBus.Storage.MongoDB.AcceptanceTests/When_mixing_persistence_with_other_persistence_for_sagas_and_outbox.cs

@@ -58,7 +58,7 @@ public Task Handle(StartSaga message, IMessageHandlerContext context)
 
             protected override void ConfigureHowToFindSaga(SagaPropertyMapper<MySagaData> mapper)
             {
-                mapper.ConfigureMapping<StartSaga>(m => m.DataId).ToSaga(s => s.DataId);
+                mapper.MapSaga(s => s.DataId).ToMessage<StartSaga>(m => m.DataId);
             }
 
             public class MySagaData : ContainSagaData

src/NServiceBus.Storage.MongoDB.AcceptanceTests/When_storing_saga_with_high_contention.cs

@@ -85,8 +85,9 @@ public HighContentionSaga(Context testContext)
 
             protected override void ConfigureHowToFindSaga(SagaPropertyMapper<HighContentionSagaData> mapper)
             {
-                mapper.ConfigureMapping<StartSaga>(m => m.SomeId).ToSaga(d => d.SomeId);
-                mapper.ConfigureMapping<AdditionalMessage>(m => m.SomeId).ToSaga(d => d.SomeId);
+                mapper.MapSaga(d => d.SomeId)
+                    .ToMessage<StartSaga>(m => m.SomeId)
+                    .ToMessage<AdditionalMessage>(m => m.SomeId);
             }
 
             public async Task Handle(StartSaga message, IMessageHandlerContext context)

src/NServiceBus.Storage.MongoDB.Tests/Sagas/Migration/When_migrating_NServiceBus_dot_MongoDB.cs

@@ -60,7 +60,7 @@ public Task Handle(MigrationStartMessage message, IMessageHandlerContext context
 
             protected override void ConfigureHowToFindSaga(SagaPropertyMapper<NServiceBusMongoDBLegacySagaData> mapper)
             {
-                mapper.ConfigureMapping<MigrationStartMessage>(msg => msg.Id).ToSaga(saga => saga.Id);
+                mapper.MapSaga(saga => saga.Id).ToMessage<MigrationStartMessage>(msg => msg.Id);
             }
         }
 

src/NServiceBus.Storage.MongoDB.Tests/Sagas/Migration/When_migrating_NServiceBus_dot_Persistence_dot_MongoDb.cs

@@ -50,7 +50,7 @@ public Task Handle(MigrationStartMessage message, IMessageHandlerContext context
             protected override void ConfigureHowToFindSaga(
                 SagaPropertyMapper<NServiceBusPersistenceMongoDBLegacySagaData> mapper)
             {
-                mapper.ConfigureMapping<MigrationStartMessage>(msg => msg.Id).ToSaga(saga => saga.Id);
+                mapper.MapSaga(saga => saga.Id).ToMessage<MigrationStartMessage>(msg => msg.Id);
             }
         }
 

src/NServiceBus.Storage.MongoDB.Tests/Sagas/PropertyTypesTestSaga.cs

@@ -14,7 +14,7 @@ public Task Handle(PropertyTypesTestSagaDataStartMessage message, IMessageHandle
 
     protected override void ConfigureHowToFindSaga(SagaPropertyMapper<PropertyTypesTestSagaData> mapper)
     {
-        mapper.ConfigureMapping<PropertyTypesTestSagaDataStartMessage>(msg => msg.Id).ToSaga(saga => saga.Id);
+        mapper.MapSaga(saga => saga.Id).ToMessage<PropertyTypesTestSagaDataStartMessage>(msg => msg.Id);
     }
 }