Reinstate RTEKind enum entries to the original order before 41c3b6
Reinstate RTEKind enum entries to the original order before 41c3b6

Commit 41c3b6 changed the numbering of RTEKind (with the intent to
converge with upstream ordering). RTEKind is included in the
RangeTblEntry struct, which in turn is included in a parse tree. Parse
trees are serialized (via `nodeToString`) in the catalog when we store
view definitions. That means re-ordering an ostensibly internal enum
will break catalog compatibility. Reverting the re-ordering of
`RTEKind`.

cjcjameson/gpdb,rvs/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,lisakowen/gpdb,xinzweb/gpdb,xinzweb/gpdb,50wu/gpdb,ashwinstar/gpdb,janebeckman/gpdb,lisakowen/gpdb,janebeckman/gpdb,Chibin/gpdb,rvs/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Chibin/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,Chibin/gpdb,lisakowen/gpdb,50wu/gpdb,edespino/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,rvs/gpdb,yuanzhao/gpdb,Chibin/gpdb,adam8157/gpdb,Quikling/gpdb,50wu/gpdb,Chibin/gpdb,xinzweb/gpdb,yuanzhao/gpdb,rvs/gpdb,Chibin/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,edespino/gpdb,xinzweb/gpdb,kaknikhil/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,adam8157/gpdb,edespino/gpdb,Quikling/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,xinzweb/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,Chibin/gpdb,lisakowen/gpdb,edespino/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,edespino/gpdb,rvs/gpdb,xinzweb/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,Quikling/gpdb,kaknikhil/gpdb,adam8157/gpdb,Chibin/gpdb,lisakowen/gpdb,50wu/gpdb,Quikling/gpdb,jmcatamney/gpdb,kaknikhil/gpdb,rvs/gpdb,adam8157/gpdb,lisakowen/gpdb,janebeckman/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,adam8157/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,50wu/gpdb,Chibin/gpdb,janebeckman/gpdb,Quikling/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,edespino/gpdb,edespino/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,50wu/gpdb,kaknikhil/gpdb,edespino/gpdb,janebeckman/gpdb,Quikling/gpdb,Chibin/gpdb,rvs/gpdb,adam8157/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,adam8157/gpdb,janebeckman/gpdb,rvs/gpdb,janebeckman/gpdb,greenplum-db/gpdb,edespino/gpdb,lisakowen/gpdb,Quikling/gpdb,50wu/gpdb,cjcjameson/gpdb,Quikling/gpdb,yuanzhao/gpdb,xinzweb/gpdb,Quikling/gpdb,Quikling/gpdb,ashwinstar/gpdb,rvs/gpdb,edespino/gpdb,lisakowen/gpdb,janebeckman/gpdb,50wu/gpdb,janebeckman/gpdb