* Move query-processor.util/remove-lib-uuids to lib.schema.util

This function will soon be needed in lib.schema.util in order to implement distinct order-by clause schema checking.

This function feels like it should live in lib.util instead of lib.schema.util, but that would create the following
circular import dependency since lib.util indirectly requires stuff from lib.schema.util:

  lib.schema.util -> lib.util -> lib.schema.util

* Don't create queries with duplicate order-bys in remove_replace_test.cljc

Otherwise, theses tests would fail soon when we add update the order-by schema to reject duplicates.

* Declare lib.order-by/order-bys to return ::lib.schema.order-by/order-bys

Previously it inlined the schema instead.

* Disallow duplicate order-by clauses in ::lib.schema.order-by/order-bys

Fixes: 39384