fix t2.nano usage

[GarrettBeatty]

Issue #, if available: Update tests to use t3.micro free tier

it looks like there was a recent change where t3.micro is free tier now. so this updates the test to select "yes" for free tier so that t3.micro is used ( i couldnt find any news/docs on this change though so maybe im missing something)

below is query result i got when doing describe instances in us-west-2

InstanceType FreeTierEligible Architecture CPU Cores Memory (MiB)
------------ ---------------- ------------ --------- ------------
t2.2xlarge              False x86_64               8        32768
t3.xlarge               False x86_64               2        16384
t3.2xlarge              False x86_64               4        32768
t2.large                False x86_64               2         8192
t3.medium               False x86_64               1         4096
t3.large                False x86_64               1         8192
t2.micro                False i386, x86_64         1         1024
t3.micro                 True x86_64               1         1024
t3.nano                 False x86_64               1          512
t2.medium               False i386, x86_64         2         4096
t2.small                False i386, x86_64         1         2048
t3.small                 True x86_64               1         2048
t2.xlarge               False x86_64               4        16384
t2.nano                 False i386, x86_64         1          512

Description of changes:

1. use t3 micro.

• testing*
  im not able to test in my personal isengard account because my account still shows t2.nano as free tier (idk why)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.11%. Comparing base (520a18b) to head (37fa9d2).
Report is 5 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #964   +/-   ##
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  Coverage   62.11%   62.11%           
=======================================
  Files         294      294           
  Lines       10813    10813           
  Branches     1616     1616           
=======================================
  Hits         6717     6717           
  Misses       3494     3494           
  Partials      602      602           

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