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

[Copilot]

NServiceBus 10.0.0-alpha.18 deprecates ConfigureMapping<TMessage>().ToSaga() in favor of MapSaga().ToMessage<TMessage>().

Changes

Updated all 6 saga mapping implementations in test projects:

• When_storing_saga_with_high_contention.cs
• When_mixing_persistence_with_other_persistence_for_sagas_and_outbox.cs
• When_custom_provider_registered.cs
• PropertyTypesTestSaga.cs
• When_migrating_NServiceBus_dot_Persistence_dot_MongoDb.cs
• When_migrating_NServiceBus_dot_MongoDB.cs

Example

Before:

mapper.ConfigureMapping<StartSaga>(m => m.SomeId).ToSaga(d => d.SomeId);
mapper.ConfigureMapping<AdditionalMessage>(m => m.SomeId).ToSaga(d => d.SomeId);

After:

mapper.MapSaga(d => d.SomeId)
    .ToMessage<StartSaga>(m => m.SomeId)
    .ToMessage<AdditionalMessage>(m => m.SomeId);

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