Use t3 micro for tests

[GarrettBeatty]

Issue #, if available:
DOTNET-8126

Description of changes:

1. Use t3.micro instead of t2.micro. See ticket details for more info

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.55%. Comparing base (2ab804b) to head (486869d).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #934       +/-   ##
===========================================
+ Coverage   38.67%   63.55%   +24.88%     
===========================================
  Files         284      284               
  Lines       11040    11040               
  Branches     1537     1537               
===========================================
+ Hits         4270     7017     +2747     
+ Misses       6446     3470     -2976     
- Partials      324      553      +229     

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