feat: add new Standard_DC[x]s_v2 VM SKUs

[mboersma]

Reason for Change:
Adds four new VM SKUs picked up by the pkg/helpers/generate_azure_constants.py script:

• Standard_DC1s_v2
• Standard_DC2s_v2
• Standard_DC4s_v2
• Standard_DC8_v2

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:
According to the accelerated networking query these VM types do not support accelerated networking, so they weren't added to that list.

[codecov]

Codecov Report

Merging #2647 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2647      +/-   ##
==========================================
+ Coverage   71.76%   71.77%   +0.01%     
==========================================
  Files         134      134              
  Lines       25001    25017      +16     
==========================================
+ Hits        17941    17957      +16     
  Misses       6010     6010              
  Partials     1050     1050

[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [jackfrancis,mboersma]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment