Skip constraint tests

[dauinsight]

Django 5.0 introduces 3 new constraint tests that fail with:

AssertionError: ValidationError not raised

In Django 4.1, we encountered tests that failed for the same reason and added them to the list of skipped tests:

Django 4.1 added a new function to CheckConstraint class which calls Q.check() which is also new. 

SQL generated by Q.check:

SELECT 1 AS [_check] FROM WHERE COALESCE((10 > (42)), True) = True

SQL server does not support booleans being used in SQL

coalesce class/function probably needs an `as_microsoft`.