opt: INSERT ON CONFLICT behaves differently in opt test than demo

[mgartner]

The follow test results in an error, but the same statements are successful in the demo. This is likely an inconsistency between the test catalog and the opt catalog:

exec-ddl
CREATE TABLE uniq_constraint_and_partial_index (
  k INT PRIMARY KEY,
  a INT,
  b INT,
  UNIQUE INDEX (a) WHERE b > 11,
  UNIQUE WITHOUT INDEX (a) WHERE b < -1,
  UNIQUE WITHOUT INDEX (a) WHERE b > 0
)
----


norm
INSERT INTO uniq_constraint_and_partial_index VALUES (2, 2, 2)
ON CONFLICT (a) WHERE b > 10 DO NOTHING
----

Jira issue: CRDB-13362