[FIX] mail: do not open document chat window without access rights

Before this commit, a user could unintentionally discard a
notification from a document that he does not have access
rights at the moment.

Steps to reproduce:

1. Setup:
- Odoo with multi-company
- Two companies: "MyCompany" and "SuperCompany"
- Two users "Admin" and "Demo", both have access to being in
  both companies
- "Demo" has Notification management in Odoo in the user preferences.
- "Admin" is logged in "MyCompany"
- "Demo" is logged in "SuperCompany"

2. Scenario:
- "Admin" mentions "Demo" in a log of a document from "MyCompany"
- "Demo" receives the notification and click on the notification
  from messaging menu.
> Dialog prompts that Demo does not have access to the document (OK)
> Empty chat window is open (not OK)
- "Demo" closes the chat window
> Notification is marked as read (not OK)

This commit fixes the issue by aborting the opening of a
chat window if the user does not have the access rights
at the moment. It should prevent marking the notification
as read by mistake by closing the chat window.

Task-ID 1931313

closes odoo/odoo#30414

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