fix(i): Remove flakyness of AES decrypt test

[fredcarle]

Relevant issue(s)

Resolves #3240

Description

This PR fixes a flaky test where the modification of the cypher text was supposed to cause it to fail decryption. The modification turned out to sometime be the same as the actual cypher text.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).

How has this been tested?

Run the TestDecryptAES test.

Specify the platform(s) on which this was tested:

• MacOS

[islamaliev]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.55%. Comparing base (198454b) to head (220d5cb).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3241      +/-   ##
===========================================
+ Coverage    77.53%   77.55%   +0.02%     
===========================================
  Files          382      382              
  Lines        35263    35263              
===========================================
+ Hits         27340    27347       +7     
+ Misses        6297     6292       -5     
+ Partials      1626     1624       -2     

Flag	Coverage Δ
all-tests	77.55% <ø> (+0.02%)	⬆️

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see 14 files with indirect coverage changes

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[AndrewSisley]

LGTM, and thanks for the comment :)