Do not use INSERT IGNORE when upserting to MariaDB
#49890
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Follow up to #49840.
In that PR, the logic for inserting with skipping duplicates was rewritten to use
INSERT IGNORE.As it turned out in #49840 (comment), this change generates a warning inside the database. So in this PR, I reverted that change. Also added a test case to avoid such change in the future.
cc @jhawthorn