[release/7.0] Include table name for overrides in snapshot. #29820
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This is a port of #29819
Fixes #29534
Description
The model snapshot generated for a migration that includes types in a TPH hierarchy with table-specific configuration doesn't include the table name for derived classes.
Customer impact
The generated migration will not compile until the customer fixes it manually.
How found
Multiple customer reports on 7.0
Regression
Yes.
Testing
Added tests for the affected scenario
Risk
Low; the fix only impacts design-time tooling.