[IMP] mail: use minimal context when rendering mail-related QWeb templates

Use option recently introduced to use a minimal context when rendering
some mail templates such as

 * notification template used to decorate messages sent to recipient
   when using email-based notifications;
 * user assignation template used when people are assigned on a record
   and a notification is sent to inbox or email;
 * message_post_with_template now uses minimal context meaning calls to
   that method should be sure evaluation context is correctly set in
   the given values;

This optimization allows to save some queries every time one of those
template is used, meaning all tests gain between 1 to 4 queries depending
on their complexity.

This commit is related to task ID 1817951. Closes #23291 .

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