Generate values for PK properties that are also self-referencing FK properties #22585
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Fixes #22573
Description
This is a regression from preview 8 on a very common case for a major new feature. We added FK constraints to the TPT model in RC1, but this broke value generation for the PK property of any TPT mapping.
Customer Impact
Very common scenario on a major new feature.
How found
Customer reported moving from preview 8 to RC1.
Test coverage
We were lacking test coverage for change tracking in TPT models. This PR adds a TPT variation to our main change tracking tests (1622 tests). This revealed one additional bug which we will triage separately.
Regression?
New feature in 5.0, but regression from preview 8.
Risk
Low. Issue is well understood and fix is small.