RATIONALE

In order to prepare upcoming improvements for marketing automation
application, as well as performance improvements, some tests are added
to improve coverage and cover some synchronization use cases.

SPECIFICATIONS

Add some tests improve coverage of synchronization, as we recently
discovered limitations

  * "opposite" triggers when checking brother traces to skip in
    'action_update_participants' (which synchronizes traces): sub
    addons (sms, whatsapp) is not taken into account;
  * 'schedule_date' is not correct for user-based activities (e.g.
    mail_open, mail_click, ...) when new activities are added to
    a campaign. They should not have scheduled dates, as it depends
    on user action. Date is correct for activities when participants
    enter child activities but not when doing the synchronize;
  * add some checks on participant state;
  * globally try to improve some corner cases coverage;

Add some tests to improve coverage of bounce / fail behavior with
various activities, as we want to make it clearer how MA should
behave when dealing with issue. First step is to assert current
behavior and fix some odd bits.

Notably in some cases trace update is missing, notably with SMS
sending with does not call trace update method, which means some
triggers are not processed.

Various fixes are included in this branch, spotted by newly added tests.
See commits for more details.

Task-4224152: [marketing_automation] Performance / Scalability