Add unit test to lorawan device model creation page

[kbeaugrand]

Description

What's new?

• Add unit test to lorawan device model creation page

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 #456 (7ec9a02) into main (0cab54f) will increase coverage by 0.42%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
+ Coverage   56.73%   57.15%   +0.42%     
==========================================
  Files         111      111              
  Lines        3340     3338       -2     
==========================================
+ Hits         1895     1908      +13     
+ Misses       1445     1430      -15     

Impacted Files	Coverage Δ
...ent/Pages/DeviceModels/CreateDeviceModelPage.razor	68.34% <ø> (+12.63%)	⬆️
...s/DeviceModels/LoRaWAN/CreateLoraDeviceModel.razor	0.00% <0.00%> (ø)
...rtal/Client/Validators/LoRaDeviceModelValidator.cs	100.00% <ø> (ø)

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