* Adds new functionality to the migrations.
This requires a migration to call Context.SetDone() on the migration context. This happens automatically on scoped migrations before the scope is completed. But migrations inheriting the UnScopedMigrationBase needs to call this manually, inside the scopes or when it is considered done.
Thereby, we minimize the risk (and eliminate it for SqlServer) that a migration is executed but the state is not saved.
If a migration is executed without the SetDone is called, the migration upgrader throws an error, so we do not start executing the next migration
* Updated tests
* Renamed after review suggestion
* Rename in test
* More renaming after review
* Remove public modifier from interface
* Add missing space in exception message
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Co-authored-by: nikolajlauridsen <nikolajlauridsen@protonmail.ch>
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