[release/9.0] Don't throw on non-transactional migration operation warning. #34830
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Fixes #34829
Description
In EF Core 9 we introduced a warning exception when a migration is applied, it contains more than one operation and one of them can't be executed in a transaction. However, we found that there are some non-transactional operations on SQL Server that cannot be separated into several migrations. So we decided to downgrade this to a logged warning.
Customer impact
Exception thrown when applying a migration in the above scenario.
How found
App writing.
Regression
No, new feature
Testing
Tested manually.
Risk
Low.