Purpose of this commit is to clean some bits of code, notably calls to
message_post/log as well as notification methods. It will ease performance
improvement work.
Small optimization: account: read content after extension check
Parameter cleaning
* use message log with kwargs instead of args;
* remove message post after hook useless parameters;
* remove _notify_email_recipients useless message parameter;
* remove message_notify useless send_after_commit parameters;
* remove message post params matching default values;
Other improvements
* remove message_post commands support for partners and channels;
* only calls message_post with ids list for channels and partners. We
don't support mix of ids and command anymore to simplify code;
* remove support of private discussion in mail.thread adding partners
as recipients, as there is no use anymore;
Related to task 1943901
Linked to PR #32404
Xavier-Do
c9d173a3e7