PURPOSE

Improve daily management of surveys by adding a responsible and
removing states to use an archive-based flow instead.

SPECIFICATIONS

The goal of the draft state on survey is to have the survey under edition
mode before before sending it to participants. Under this mode:
  - the responsible can test it (can be done with "In Progress" mode)
  - the survey can't be answered (same as the state closed)

The risk that the survey can be leaked before being ready is really
limited. If it's a live survey, participants will have to guess the
4 digits access code and wait for the host to go to the next question.
Else, participant will have to guess the token.

Considering these facts, the use of the draft state is very limited so
'draft' state can be dropped. If we do so, we are left with only two
stages that are 'open' and 'closed'. But whether to consider survey
open or closed can be simply achieved with active field we already
have (if active=False, survey is closed, otherwise it's considered
as open).

So with this commit, we remove the state field from survey and thus
simplify the flow. It means that we no longer require 'Start Survey'
button, and so that button is also removed, and for the closed surveys,
instead of the button 'Set to draft', now we have a 'Reopen' button
which will activate the survey. And instead of displaying few buttons
after saving a record, we now display all the buttons from beginning.

This commit also enable users to set a 'Responsible' for the survey by
adding 'user_id' field. Demo data for the same is also updated.

LINKS

Task ID-2389434
COM PR odoo/odoo#62712
ENT PR odoo/enterprise#15217
UPG PR odoo/upgrade#2006