Add Go test for the global options (nodeSelector, affinity, tolerations)

[Dominik Rosiek]

          Can we add a Go test for the global nodeSelector? I'd like to have some way to verify that everything we generate follows the setting.

Originally posted by @swiatekm-sumo in #3565 (comment)

[Mikołaj Świątek]

Resolved by #3427, #3459 and #3462.