sqllogic groupby tests have `ONLY_FULL_GROUP_BY` mode turned off

`ONLY_FULL_GROUP_BY` mode was turned off in dolthub/sqllogictest#19

Due to #4998, GroupBy validation was not running for most queries, even with `ONLY_FULL_GROUP_BY` turned on, resulting in us running a lot of queries that otherwise should've given an error. This was fixed in dolthub/go-mysql-server#3166 but caused 1134 sql logic tests to fail since those queries had been expected to run. Upon investigation, it seems that many of these queries failed because they weren't actually valid queries in MySQL with `ONLY_FULL_GROUP_BY` turned on (which is the default). However, since our GroupBy validation is imperfect, there may be some failing queries that shouldn't be failing, but we won't know unless we comb through all of them.

Since it's tedious to go through over a thousand queries to check for MySQL `ONLY_FULL_GROUP_BY` validity, we've decided to turn `ONLY_FULL_GROUP_BY` mode off to continue testing all groupby sql logic queries.