Fix #811 - Add available frequency plans from API and remove hardcode…

[kbeaugrand]

…d frequency plans from Web pages

Description

What's new?

• Story: As a developer I would like to have dynamic Frequency plans on the portal #811

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 #1038 (169f1a5) into main (74a6ab8) will increase coverage by 0.05%.
The diff coverage is 92.68%.

@@            Coverage Diff             @@
##             main    #1038      +/-   ##
==========================================
+ Coverage   85.24%   85.30%   +0.05%     
==========================================
  Files         177      179       +2     
  Lines        5810     5847      +37     
==========================================
+ Hits         4953     4988      +35     
- Misses        857      859       +2     

Impacted Files	Coverage Δ
.../LoRaWAN/Concentrator/ConcentratorDetailPage.razor	79.71% <80.00%> (+0.34%)	⬆️
.../LoRaWAN/Concentrator/CreateConcentratorPage.razor	95.45% <88.88%> (-1.69%)	⬇️
...ient/Services/LoRaWanConcentratorsClientService.cs	100.00% <100.00%> (ø)
...rs/v1.0/LoRaWAN/LoRaWANFrequencyPlansController.cs	100.00% <100.00%> (ø)
...Portal/Shared/Models/v1.0/LoRaWAN/FrequencyPlan.cs	100.00% <100.00%> (ø)

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