Original PR description

> Hello,
>
>Thank you for your contribution but the version 12.0 is no longer supported. We only support the last 3 stable versions so no longer accepts patches into this branch.
If you wish to resubmit in 13.0, could you change the CLA file to lowercase. Also you can change your commit message to something like `[CLA] signature for SirTakobi`.
Best

_Originally posted by @mart-e in https://github.com/odoo/odoo/issues/88254#issuecomment-1106459981_

I do not have a `13.0` in local so I pushed to `14.0`.
Can I keep the file name in PascalCase or is it mandatory to have it lowercase? I see both among other CLAs.

Forward-Port-Of: odoo/odoo#89474

Original PR description

When creating a new ticket in a chat with the command '/helpdesk', the messages of
the channel are copied to the ticket description.

However, deleted messages and messages with an empty body appear in the description
as blank messages.

To avoid this, this commit adds a filter on messages that have a non empty body
when creating the ticket description.

Task-2821326

Forward-Port-Of: odoo/enterprise#26087

Original PR description

In both SLA Status Analysis and Ticket Analysis reports, create date is
set as a Date field only, while it is in fact a Datetime field inherited
from the helpdesk.ticket object in the SQL view.

This has the consequence that we cannot filter properly the information
using dates : if we set the filter to Creation Date = current month, all
tickets created on the last day of this month won't be retrieved, hence
providing incorrect results.

opw-2752878

Forward-Port-Of: odoo/enterprise#25798

Original PR description

Forward-Port-Of: odoo/enterprise#26340
Forward-Port-Of: odoo/enterprise#26321