[Fix][Helm chart] Move service.headService -> head.headService in values.yaml

[jjaniec]

Why are these changes needed?

After spending a while not understanding why my monitoring annotations wouldn't be set on the head service of my clusters I noticed the chart uses .Values.head.headService instead of .Values.service.headService like specified in the default values.yaml

This PR would do the trick but I think using .Values.head.serviceType instead of .Values.service.type in the templates would be an even better solution for consistency :)

Checks

• [x] I've made sure the tests are passing.
• Testing Strategy
  • [x] Helm template

[kevin85421]

I tested this PR manually.