Fix failing SQLServer integration tests
Adjusted the tests so that the created content is retrieved again after creation, instead of using the returned IContent.
This is needed because SQLServer, when using datetime, rounds to the closest .000, .003, or .007, which would cause the comparisons to fail.
We should consider moving away from datetime to datetime2, as the former should be avoided according to Microsoft.
https://learn.microsoft.com/en-us/sql/t-sql/data-types/datetime-transact-sql?view=sql-server-ver17
df81264794