Revert SQL/JSON features in ruleutils_15.c
Revert SQL/JSON features in ruleutils_15.c

Reverting the following commits:
https://github.com/citusdata/citus/pull/6085/commits/977ddaae56eb192c78bffae392e5b93ea034546e
https://github.com/citusdata/citus/pull/6085/commits/4a5cf06defba3fb6b3048cd0196862b765e5b900
https://github.com/citusdata/citus/pull/6085/commits/9ae19c181f49ffde67669d01dafaa869c09fa739
https://github.com/citusdata/citus/pull/6085/commits/30447117e5ff991796cf0be8e7c8e0f18547e001
https://github.com/citusdata/citus/pull/6085/commits/f9c43f43325a226729b9c2f38bbdf3900936e2d5
https://github.com/citusdata/citus/pull/6085/commits/21dba4ed08baef6750e68b6592a813e4ac40f095
https://github.com/citusdata/citus/pull/6085/commits/262932da3e0cd015db3ec36d2c9ed003a352aee1

We have to manually make changes to this file.
Follow the relevant PG commit in ruleutils.c & make the exact same changes in ruleutils_15.c

Relevant PG commit:
96ef3237bf741c12390003e90a4d7115c0c854b7

citusdata/citus,citusdata/citus,citusdata/citus,citusdata/citus,citusdata/citus