Refactor/remove eui helper

[kbeaugrand]

Description

What's new?

• Remove useless code
• Add unit tests on devices controller

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #224 (b903c2d) into main (68c5a9a) will increase coverage by 4.81%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
+ Coverage   12.34%   17.15%   +4.81%     
==========================================
  Files          71       67       -4     
  Lines        2357     2005     -352     
==========================================
+ Hits          291      344      +53     
+ Misses       2066     1661     -405     

Impacted Files	Coverage Δ
...Hub.Portal/Server/Controllers/DevicesController.cs	66.25% <100.00%> (+66.25%)	⬆️

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