Purpose is to clearly separate various available demo surveys, their user
inputs and input lines. It is easier to update and maintain those demo
data in several files than hidden in big files or CSV files. No change
should occur with this commit as this is only some data manipulation.
We also quickly cleanup some demo data in this commit. Notably
* remove unnecessary user inputs;
* improve passed / succeeded statistics by improving or adding right
answers;
* fix some typos;
Task-2634805
PR odoo/odoo#72298
