Move Identity tests from SQL Server to SQLite for better reliability (#10300)

...ityFrameworkCore/test/EF.InMemory.Test/InMemoryContext.cs

...workCore/test/EF.InMemory.Test/InMemoryDatabaseFixture.cs

...workCore/test/EF.InMemory.Test/InMemoryEFOnlyUsersTest.cs

...workCore/test/EF.InMemory.Test/InMemoryEFUserStoreTest.cs

...re/test/EF.InMemory.Test/InMemoryStoreWithGenericsTest.cs

...NetCore.Identity.EntityFrameworkCore.InMemory.Test.csproj

...ntityFrameworkCore/test/EF.InMemory.Test/RoleStoreTest.cs

...rameworkCore/test/EF.InMemory.Test/TestIdentityFactory.cs

...entity/EntityFrameworkCore/test/EF.Test/CustomPocoTest.cs

src/Identity/EntityFrameworkCore/test/EF.Test/DbUtil.cs

...ntity/EntityFrameworkCore/test/EF.Test/DefaultPocoTest.cs

...ntityFrameworkCore/test/EF.Test/MaxKeyLengthSchemaTest.cs

...osoft.AspNetCore.Identity.EntityFrameworkCore.Test.csproj

...tyFrameworkCore/test/EF.Test/SqlStoreOnlyUsersTestBase.cs

...tity/EntityFrameworkCore/test/EF.Test/SqlStoreTestBase.cs

...tyFrameworkCore/test/EF.Test/UserOnlyCustomContextTest.cs

...Identity/EntityFrameworkCore/test/EF.Test/UserOnlyTest.cs

...workCore/test/EF.Test/UserStoreEncryptPersonalDataTest.cs

...dentity/EntityFrameworkCore/test/EF.Test/UserStoreTest.cs

...tyFrameworkCore/test/EF.Test/UserStoreWithGenericsTest.cs