Turn identity map collisions from exception to deprecation notice #10878
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In #10785, a check was added that prevents entity instances from getting into the identity map when another object for the same ID is already being tracked.
This caused regressions for users that work with application-provided IDs and expect this condition to fail with
UniqueConstraintViolationExceptions
when flushing to the database.Thus, this PR turns the exception into a deprecation notice. Users can opt-in to the new behavior. In 3.0, the exception will be used.
Implements #10871.