[REF] survey: on survey.user_input.line, rename value_suggested{_row} fields

PURPOSE

As new features are about to land in survey, notably live interactions [1]
and new survey building [2] performing a pre cleaning is necessary. In this
PR we clean survey models by: removing unnecessary fields, cleaning some code
and finally renaming models.

SPECIFICATIONS

A new naming for ``survey.question.answer`` has been recently introduced:
``suggested_answer_ids`` and ``matrix_row_ids``. In this commit we propagate
that naming to survey.user_input.line model. New naming is

  * ``suggested_answer_id``: one chosen value for single / multiple choice.
    It is also used for matrix columns as those indicates the value to give
    on a given row;
  * ``matrix_row_id``: the related row of the suggested answer for matrix
    questions;

It adds two benefits

  * it finishes by _id which is always a good idea for m2o fields;
  * it better indicates the use;

LINKS

[0] Related to Task ID 2061901 (survey models cleaning and preparation)
[1] Task ID 1972640 (live interactions)
[2] Task ID 2119587 (new frontend for building surveys)

PR #40765

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