[MERGE][REF] survey: further refine access mode

Purpose of this merge is to improve access mode and authentication management
introduced at 9771fdfe8f658fd0f3c270173a3d19b614ec8997 . Purpose of this cleaning is to simplify options and make
them clearer. Instead of a selection with 4 entries we propose to use two
fields on survey model :

 * access_mode: everyone with a public link can access and answer; or only
   invited people;
 * login required: whether people have to login to answer or not;

All main use cases are covered with combination of those two options.

In this merge we also refine survey routes now using an access token defined
on survey model instead of its ID. It allows to keep surveys somehow private
especially for surveys on invitation only.

Some fixes related to last changes are also done in this merge. Some
improvements in survey templates are also provided to ease their update.

This merge is linked to task ID 1932508 and PR #30508.

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