AACT-603: Create design_groups_data method in v2 processor

[Javier-Jimenez-18]

• Created design_groups_data mapper method in the v2 processor.
• Added new column group_intervention_names to design_groups table and updated design_groups_data method.
• Created RSpec test case to test the design_groups_data method.
• All 7 Test Cases PASS in processor_v2_spec.rb:

[Javier-Jimenez-18]

• Undid the addition of the group_intervention_names column
• Rollback the migration and deleted the migration file
• Removed the column from method design_groups_data and from the RSpec test
• Removed the config/connections.yml file

Test case for method design_groups_data PASS and processor_v2_spec file PASS: