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Adds a regression test for parallel CREATE INDEX for BRIN indexes, to improve coverage for BRIN code, particularly code to allow parallel index builds introduced by b43757171470. The test is added to pageinspect, as that allows comparing the index to one built without parallelism. Another option would be to just build the index with parallelism and then check it produces correct results. But checking the index is exactly as if built without parallelism makes these query checks unnecessary. Discussion: https://postgr.es/m/1df00a66-db5a-4e66-809a-99b386a06d86%40enterprisedb.com