UseNLog allow fallback to only EnvironmentName for NLog config

[snakefoot]

Use LoadConfigurationFromFile instead of explicit creating XmlLoggingConfiguration for better NLog InternalLogger output.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 55.88235% with 15 lines in your changes missing coverage. Please review.

Project coverage is 81.01%. Comparing base (95932f4) to head (9dca19d).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...tensions.Hosting/Extensions/ConfigureExtensions.cs	55.88%	5 Missing and 10 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #773      +/-   ##
==========================================
- Coverage   81.47%   81.01%   -0.46%     
==========================================
  Files          19       19              
  Lines        1808     1817       +9     
  Branches      321      320       -1     
==========================================
- Hits         1473     1472       -1     
- Misses        193      198       +5     
- Partials      142      147       +5     

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