Xray should provide structural organization with folders for Test Executions

In the Test Execution, users should be able  to see a structure like the Test Repository/Test Plan Board:

1) Firstly, the master view (on the left) inside the Test Execution is empty
2) Users can create different folders to have a hierarchy in the master view
3) Inside each folder, users can add the test cases that they want to execute.

When created from the Test Repository, the Test Execution should keep the structure from the Test Repository.

Mockup example: