[release/8.0] Throw for conflicting explicit relationships when configuring an entity type as keyless. #32032
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Fixes #24722
Description
We throw exceptions when configuring certain relationships to keyless entity type, but we silently override configuration when configuring the entity type as keyless last.
Customer impact
An unhelpful exception is thrown.
How found
Customer reported on 5.0
Regression
No.
Testing
Added tests.
Risk
Low.