Move off of SqlLocalDB for ARM support

[jbogard]

SQL Local DB isn't supported on ARM (see dotnet/SqlClient#1441), which means I can't run AutoMapper tests on my Mac. I think the way forward would be something like TestContainers.

Would probably not be a small change in our integration tests. But as-is, I can't really develop on AutoMapper.

[lbargaoanu]

So we would run SQL in a container. It would be nice to know how much slower that would be.

[lbargaoanu]

Another option here is Sqlite. While it has its own peculiarities, it's trivial to run our tests with it. Maybe we're lucky and won't hit corner cases in the future. If you want to try it, I can push smth in my branch.