Clarify method of listening for postgres changes in trigger node and required database permissions for Postgres triggers

[bfritton]

Added a note on database permissions for creating listing events in PostgreSQL, and how listening for those events works under the hood.

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Note

Clarifies how the Postgres Trigger node listens for events and the database permissions required to enable it.

• Docs (docs/integrations/builtin/trigger-nodes/n8n-nodes-base.postgrestrigger.md):
  • Add note explaining event-listening behavior:
    • Auto-creates Postgres trigger on workflow activation/testing; removes it on deactivation/stop.
    • Trigger invokes an auto-created procedure to notify n8n.
    • Detail required privileges: ability to create/execute triggers and procedures; table owner/superuser or TRIGGER privilege; CREATE on target schema.

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