[MAINTENANCE] Remove and exchange duplicate test for privileged containers

[horecoli]

In the current version of the testsuite, there are 2 tests for privileged containers. They are:

• The "in-house" implementation (privileged) which allows for the exclusion of certain containers from the test.
• The Kubescape solution (privileged_containers) which lacks this functionality to exclude containers from the test.

Since privileged_containers is an essential test, it would be better to replace it with the privileged test, which fulfills the requirements including container exclusion. The best solution would be to swap the names of these two tests and remove the Kubescape implementation, at least until container exclusion functionality is implemented in the Kubescape repository.