test/control-plane: add Execute method for additional test env setup
test/control-plane: add Execute method for additional test env setup

Add a method to the ControlPlaneTest type to enable additional setup
before executing the specific test scenario.

Signed-off-by: Fabio Falzoi <a3958b26c18ad01cbee6627c44adab1006401257@isovalent.com>

cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium