Improve mock server:
- add support for mocked `fetch`
- add support for `active_test`
- add support for x2m `in` in domains
- add support for default values computed from a function
- implement a more natural "next id" compute
- allow initial data without ids
- ensure write and x2m commands integrity
- improve bad data/bad commands error messages
- always warn for failing RPC, not only in debug mode
- fix all existing tests that had inconsistency data
Other changes done in mail (or dependents) that are not just related to tests:
- remove `direct_partner` from formatter result
->`correspondent` can be computed from other keys, especially `members`
- fix `livechat_visitor` convertData
-> only process if there is value
- add `current_partner` and `current_user_id` as `init_messaging` result
-> easier to mock than session
- remove usage of `need_moderation`
-> that was just a search indirection to `moderation_status`
- adapt `partner_id` -> `res_partner_id` key in `_notification_format`
-> to be consistent with field name
- add name in result of `mail_partner_format`
-> sometimes display_name is not the same
- remove usage of `is_moderator`
-> that was just an indirection to `moderation_channel_ids`
Enterprise counterpart: https://github.com/odoo/enterprise/pull/11523
task-2287171
closesodoo/odoo#55854
X-original-commit: 7ba3fecb3377a720d1eb70e7515a0c45da73836d
Related: odoo/enterprise#12391
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>