Fix CodeQL analysis alerts

[kbeaugrand]

Description

What's new?

• Fix CodeQL alerts

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

Checklist before merge

Developer's responsibilities

• This pull request merges to main
• Approved by at least one developer
• Pull request build has passed
• Staging app has been deployed successfully

Product Owner's responsibilities

• No issues have been found on staging environment
• Product Owner has approved the release

[codecov-commenter]

Codecov Report

Merging #205 (7e1b539) into main (233066b) will decrease coverage by 0.01%.
The diff coverage is 1.27%.

@@           Coverage Diff            @@
##            main    #205      +/-   ##
========================================
- Coverage   0.66%   0.64%   -0.02%     
========================================
  Files         71      71              
  Lines       2414    2324      -90     
========================================
- Hits          16      15       -1     
+ Misses      2398    2309      -89     

Impacted Files	Coverage Δ
...ub.Portal/Server/Controllers/CommandsController.cs	0.00% <0.00%> (ø)
...Hub.Portal/Server/Controllers/ConfigsController.cs	0.00% <0.00%> (ø)
...ortal/Server/Controllers/DeviceModelsController.cs	0.00% <0.00%> (ø)
...Hub.Portal/Server/Controllers/DevicesController.cs	0.00% <0.00%> (ø)
...ub.Portal/Server/Controllers/GatewaysController.cs	0.00% <0.00%> (ø)
...ub.Portal/Server/Filters/ApiRequiredScopeFilter.cs	0.00% <ø> (ø)
.../AzureIoTHub.Portal/Server/Helpers/ConfigHelper.cs	0.00% <0.00%> (ø)
....Portal/Server/Managers/ConnectionStringManager.cs	0.00% <0.00%> (ø)
...erver/Managers/DeviceProvisioningServiceManager.cs	0.00% <0.00%> (ø)
.../AzureIoTHub.Portal/Server/Helpers/DeviceHelper.cs	15.15% <11.76%> (-0.35%)	⬇️
... and 3 more

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