Fix error when executing insert on secondary worker node

[templarzq]

Citus version: master
DESCRIPTION:
set citus.writable_standby_coordinator ="on", when insert values on secondary work node, if the values belong to local shard tables, the plan will run on local node ,this will trigger an error.
this pull request will fix this error, route the plan to correct primary node to execute the insert sql.

[templarzq]

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