Add libevent to GitHub integration CI

[andrewhop]

Issues:

Resolves CryptoAlg-2465

Description of changes:

Libevent already works with AWS-LC thanks to other compatibility work. This adds a test to make sure it keeps working.

Testing:

Tested the script locally but need to see what happens with GitHub actions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.06%. Comparing base (8258d73) to head (bf26b9d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1615   +/-   ##
=======================================
  Coverage   78.05%   78.06%           
=======================================
  Files         562      562           
  Lines       94600    94600           
  Branches    13575    13575           
=======================================
+ Hits        73840    73846    +6     
+ Misses      20168    20162    -6     
  Partials      592      592           

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