[jOOQ/jOOQ#15351] Better support for PG triggers

- DELETE triggers should RETURN OLD, not RETURN NEW
- Clean up stale trigger functions, if their trigger doesn't exist

jOOQ/src/main/java/org/jooq/impl/CreateTriggerImpl.java

@@ -861,6 +861,36 @@ package org.jooq.impl;
 
 
 
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