[fix] create ipv6/AAAA records only for dualstack flavors

[amold1]

What this PR does / why we need it:
We should only create AAAA records for dual-stack flavors and not all dns flavors. Currently we create A and AAAA records for all nodes for all dns based loadbalancing flavors.(a linode by default has one IPv4 and one IPv6 IP regardless of flavor)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 66.04%. Comparing base (cc56907) to head (636163c).

Files	Patch %	Lines
cloud/services/domains.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
- Coverage   66.10%   66.04%   -0.07%     
==========================================
  Files          42       42              
  Lines        2623     2624       +1     
==========================================
- Hits         1734     1733       -1     
- Misses        794      795       +1     
- Partials       95       96       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.