[IMP-REF] survey : refactor questions naming, validation and save flow

This commit simplifies the answer_tag and question name
by removing the survey_id (uses now only question id) for the most simple cases

Factorise the save and validate survey answers to avoid duplicate code

Review posted submit data :
- process all questions by question type (instead of using form data
(key,value) that needed key parsing and was un-typed)
- regroup answers by questions and adapt all validation and save flow
- remove post data in save and validate question methods
  and uses directly the answer(s)
- remove useless input names

The tests have been adapted consequently

Task ID : 1930132
PR #32419

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