[6.0.x] Return null constraint names for keys and FKs on entity types not mapped to a table. #27857
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Description
When getting the FK name the code assumed that both entity types are mapped to tables, since it's the only way an FK constraint can be created in the database.
Customer impact
When creating a foreign key between an entity type mapped to a view and an entity type mapped to a table an exception is thrown. No known workaround other than not creating the FK.
How found
Customer reported on 6.0.
Regression
Yes, From 5.0.
Testing
Added tests for this scenario.
Risk
Low risk, avoids NRE.
Partial backport of 786cb40
Fixes #27854