feat: Add additional unsupported features

[codingconcepts]

Our Postgres Compatibility page is missing some ... missing features.

[github-actions[bot]]

Files changed:

• src/current/_includes/v23.2/sql/unsupported-postgres-features.md:
• src/current/v23.2/migration-overview.md
• src/current/v23.2/migrate-from-postgres.md
• src/current/v23.2/query-behavior-troubleshooting.md
• src/current/v23.2/postgresql-compatibility.md
• src/current/v23.2/postgresql-compatibility.md

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