[REF] survey: use a common file for tests for tools and data

Purpose of this commit is to clean a bit survey test files before updating
them and creating new tests. In this commit we add a common file holding
user creation and we use the recently-introduced tool method to create
test users. Survey test class is done child of SavepointCase to use
breakpoints and avoid recreating data at each test.

Future commits will gradually remove unnecessary content for test_survey.py,
rewrite part of it to be easier to understand and add new tests.

This commit is linked to task ID 1911238 and PR #28831.

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