Odoo now lets users archive contact titles, such as “Doctor”, instead of deleting them. This prevents removed titles from coming back after a system upgrade while keeping historical data intact.

Description of the issue/feature this PR addresses:
- Delete a res.partner.title, exemple "Docteur"
- Upgrade base
--> Issue Docteur re appear




--
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

The mail interface logic that decides where the chatter appears on forms has been simplified and cleaned up. This makes the behavior easier to maintain and reduces the chance of layout inconsistencies without changing the user-facing workflow.

This better highlights the different cases that need to be handled.

Part of task-2871070