test: simplified availabilityset E2E cluster config

[jackfrancis]

Reason for Change:

This PR delivers a simpler cluster configuration for validating AvailabilitySet node pool configuration.

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 #2926 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2926   +/-   ##
=======================================
  Coverage   72.49%   72.49%           
=======================================
  Files         141      141           
  Lines       25847    25847           
=======================================
  Hits        18739    18739           
  Misses       6021     6021           
  Partials     1087     1087