Populate three dots of DNS for internal Services

What does this MR do?

This MR ensures that all services are populated with a longer DNS names (up to three dots), ie. <Service>.<Namespace>.svc.

Related issues

Closes #2339 (closed)

Test Plan

This MR can be quickly verified with the following command (executed in Chart's directory):

helm template \
  --release-name 'gitlab' \
  --namespace 'example' \
  --set certmanager-issuer.email='me@example.com' \
  . | grep '://' | grep -v -E '\.(io|com|org)'

It should list all the references to internal services in the correct form.

Also check:

helm template \
  --release-name 'gitlab' \
  --namespace 'example' \
  --set certmanager-issuer.email='me@example.com' \
  . | grep -A1 'name: MINIO_ENDPOINT'

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened