[5.0] Add validation for seed data with skip navigations #22908
Merged
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Part of #22883
Description
Skip navigations (i.e. many-to-many navigations; new for 5.0) could contain entities when used in seed data. However they will be ignored.
Customer Impact
With this change EF will throw an exception explaining the supported way to add seed data. Making this change after 5.0 would be a bigger breaking change as more users could be affected.
How found
Code examination.
Test coverage
This PR adds tests for the affected case.
Regression?
No.
Risk
Low. The change only affects skip navigations, which are new in 5.0.