[REF] survey: on survey.user_input{.line}, reorganize and clean model code

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

In survey.user_input.line, clean code about constraints. Purpose is to make
it easier to read and understand.

Code creating user input lines is moved from survey.user_input.line model to
survey.user_input. Indeed it is now based on a user_input record, and create
answer line related to a question, based on values coming from controllers
(and therefore frontend). It makes more sense to delegate that code to the
user_input model itself that creates its lines. Code is also rewritten to
be cleaner and easier to read.

Code computing statistics on user input records is moved from survey model
to user_input model, where it belongs. Missing translation marks are added
because translations matter.

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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