test: Use Standard_D2_v3 and low pri VMSS in E2E test configs

[jackfrancis]

Reason for Change:

Standardize E2E test config for Standard_D2_v3 VM SKUs, and low-pri VMSS where appropriate

Issue Fixed:

Requirements:

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

Notes:

[acs-bot]

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[codecov]

Codecov Report

Merging #2000 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2000   +/-   ##
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  Coverage   76.72%   76.72%           
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  Files         135      135           
  Lines       20562    20562           
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  Hits        15776    15776           
  Misses       3871     3871           
  Partials      915      915