Added [NotNullWhen(true)] for Entity IsOn & IsOff extension methods

[phillipsawyer]

Proposed change

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (29e891d) 80.68% compared to head (cfc1f94) 80.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #856      +/-   ##
==========================================
+ Coverage   80.68%   80.73%   +0.04%     
==========================================
  Files         161      161              
  Lines        4137     4137              
  Branches      410      410              
==========================================
+ Hits         3338     3340       +2     
+ Misses        636      635       -1     
+ Partials      163      162       -1     

Flag	Coverage Δ
unittests	80.73% <0.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...l/NetDeamon.HassModel/Entities/EntityExtensions.cs	44.44% <0.00%> (ø)

... and 1 file with indirect coverage changes

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