Redo RLS guides to use drizzle in all code samples

[bgrenon]

Check if we should revisit the example code in the RLS docs to use drizzle in addition to or instead of the current sql-based samples.

Example:
https://neon.tech/docs/guides/neon-rls-stack-auth#2-run-your-first-authorized-query

Slack:
https://neondb.slack.com/archives/C03ETHV2KD1/p1746387523796069