Remove unused settings in the portal

[kbeaugrand]

Description

What's new?

• Fix Bug: Remove unused settings form the portal #820

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 #961 (9ce86bf) into main (2981b3d) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #961      +/-   ##
==========================================
- Coverage   85.90%   85.89%   -0.02%     
==========================================
  Files         173      173              
  Lines        5613     5600      -13     
==========================================
- Hits         4822     4810      -12     
+ Misses        791      790       -1     

Impacted Files	Coverage Δ
src/AzureIoTHub.Portal/Server/ConfigHandler.cs	0.00% <ø> (ø)
...reIoTHub.Portal/Server/DevelopmentConfigHandler.cs	77.41% <ø> (-1.37%)	⬇️
...ureIoTHub.Portal/Server/ProductionConfigHandler.cs	77.41% <ø> (-1.37%)	⬇️
...r/ServicesHealthCheck/StorageAccountHealthCheck.cs	85.71% <75.00%> (ø)
...ver/ServicesHealthCheck/TableStorageHealthCheck.cs	100.00% <100.00%> (ø)

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