Bugfix: Add missing next page on concentrators listing

[hocinehacherouf]

Description

What's new?

• Fix Bug: Pagination on concentrators does not return next page value #1348

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

Base: 89.00% // Head: 89.21% // Increases project coverage by +0.20% 🎉

Coverage data is based on head (0005348) compared to base (de5ef92).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1365      +/-   ##
==========================================
+ Coverage   89.00%   89.21%   +0.20%     
==========================================
  Files         250      250              
  Lines        7731     7739       +8     
==========================================
+ Hits         6881     6904      +23     
+ Misses        850      835      -15     

Impacted Files	Coverage Δ
...ers/v1.0/LoRaWAN/LoRaWANConcentratorsController.cs	100.00% <100.00%> (ø)
...oTHub.Portal/Server/Mappers/ConcentratorProfile.cs	100.00% <100.00%> (ø)
...rtal/Server/Services/LoRaWANConcentratorService.cs	100.00% <100.00%> (ø)
...oTHub.Portal/Shared/Models/v1.0/PaginatedResult.cs	100.00% <100.00%> (ø)
...l/Server/Controllers/v1.0/DevicesControllerBase.cs	98.82% <0.00%> (+17.64%)	⬆️

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