Extract more shared examples for helm install pod behavior

The following discussion from !21344 (merged) should be addressed:

• @mikolaj_wawrzyniak started a discussion: (+3 comments)

  It actually does not generate one, right?

• #cluster_role_binding_resource could be more concise: !21344 (comment 258276458)

• #pod_resource service account examples should be shared too !21344 (comment 258274189)