[6.0] Flag all properties as not unknown when saving changes #26346
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Fixes #26330
Description
When saving changes to the database for an entity with a potentially unknown key value, that key value remained marked as unknown after saving if the property uses a value generator that does not generate temporary values.
Customer impact
Exception thrown when saving changes with the in-memory provider using owned collections, but also fails with other providers when using value generators that do not generate temporary values.
How found
Multiple customer reports on RC2.
Regression
Yes, from 5.0.
Testing
Test for this scenario added in the PR which runs for multiple providers and value generators.
Risk
Low; the fix is to clear the unknown flag when accepting saved changes into the state manager.