Fix/mip 39/fixes for failing tests

Created by: ThanKarab

Changelog:

• Changed the tests folder structure to the following:

   - tests
   |--- unit_tests
   |--- integration_tests

• Fixed the automatic cleanup on the node tests that was overwritten by git due to commented out tests.
• Fixed theudf_generator tests that were broken due to the float/real monet type alteration.
• Enabled the validator.
• Fixed small bugs on the integration tests.