Upgrade from 'feature' to 'system' test

[gonzar11]

Description I couldn't remove database cleaner because some specs on backends started to fail. Then I realized that it used just to truncate the database before starting run all specs. This is because some migrations are filling the database.

It closes #3564

Checklist:

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [x] I have updated Guides and README accordingly to this change (if needed)
• [x] I have added tests to cover this change (if needed)
• [x] I have attached screenshots to this PR for visual changes (if needed)

[waiting-for-dev]

Hey @gonzar11, it's been a while, but would you be willing to keep working on it? :slightly_smiling_face:

[kennyadsl]

Closing as this has no activity anymore. Thanks anyway!