[16.0][FIX] _primary_email

[mileo]

This PR fixes a critical issue with email loop detection in the helpdesk.ticket model by adding the missing _primary_email attribute, which prevents spam and duplicate ticket creation through email aliases.

Problem

The helpdesk.ticket model was missing the _primary_email attribute, causing the following issues:

1. No spam protection: The system couldn't detect when the same email address was creating multiple tickets in a short time period
2. Duplicate tickets: Multiple tickets could be created from the same email address without any loop detection
3. Log warnings: The system was logging "Primary email missing on helpdesk.ticket" messages
4. Inconsistent behavior: Different behavior between Community and Enterprise versions

Root Cause

The _detect_loop_sender_domain method in mail.thread relies on the _primary_email attribute to:

• Create search domains for detecting duplicate records
• Prevent spam by monitoring email frequency
• Associate incoming emails with existing records

When _primary_email is not defined, the method returns None, effectively disabling loop detection for that model.

[pedrobaeza]

Thanks for this. Can you please rename to [IMP] helpdesk_mgmt: Set _primary_email according commit message guidelines? https://github.com/OCA/odoo-community.org/blob/master/website/Contribution/CONTRIBUTING.rst#commit-message

[flotho]

Hi @mileo thanks for your PR.
Any chance to follow the guidelines pointed by @pedrobaeza ?

Regards

[github-actions]

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