Refactor: make nullable arguments as nullable in the declaration

[kbeaugrand]

Description

What's new?

• Refactor: make nullable arguments as nullable in the declaration

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: 87.94% // Head: 87.94% // No change to project coverage 👍

Coverage data is based on head (5a33073) compared to base (abd2b38).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1216   +/-   ##
=======================================
  Coverage   87.94%   87.94%           
=======================================
  Files         213      213           
  Lines        6944     6944           
=======================================
  Hits         6107     6107           
  Misses        837      837           

Impacted Files	Coverage Δ
...ureIoTHubPortal.Domain/Exceptions/BaseException.cs	100.00% <100.00%> (ø)
....Domain/Exceptions/InternalServerErrorException.cs	100.00% <100.00%> (ø)
...omain/Exceptions/ResourceAlreadyExistsException.cs	100.00% <100.00%> (ø)
...tal.Domain/Exceptions/ResourceNotFoundException.cs	100.00% <100.00%> (ø)

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