Testnet validators

[Viterbo]

Fixes #342

Description

This PR adds the Testnet validators. However, a problem still forbids the data from being displayed correctly.

In the Mainnet solution, the first query at the basket returns an XML with a list of Contents children nodes from which the last key is taken to perform a second query.

However, you can see that the first response of the Testnet bucket returns zero Contents children nodes, which makes the algorithm break.

Test scenarios

Checklist:

• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have cleaned up the code in the areas my change touches
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have checked my code and corrected any misspellings
• [ ] I have removed any unnecessary console messages
• [ ] I have included all english text to the translation file and/or created a new issue with the required translations for the currently supported languages
• [ ] I have tested for mobile functionality and responsiveness
• [ ] I have added appropriate test coverage
• [ ] I have updated relevant documentation and/or opened a separate issue to cover the updates (Issue URL: )

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