Remove CTE backward compatibility code
What does this MR do and why?
This MR removes the backward compatibility code for PostgreSQL CTEs where the MATERIALIZED keyword was not yet supported (<PG12).
It seems like we can safely remove this compatibility code since we require PG12+: #325639 (comment 1520812291)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #325639 (closed)