feat: add managed identity support to app insights serilog sink

[stijnmoreels]

Adds managed identity support to the Serilog Application Insights sink that lets you provide a client ID together with the ingestion connection string towards Azure Application Insights.

Closes #541

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🔨 Latest commit	35f91eb
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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f663587) 86.96% compared to head (35f91eb) 87.90%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...ts/Extensions/LoggerSinkConfigurationExtensions.cs	97.82%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
+ Coverage   86.96%   87.90%   +0.93%     
==========================================
  Files          70       69       -1     
  Lines        2593     2604      +11     
  Branches      151      149       -2     
==========================================
+ Hits         2255     2289      +34     
+ Misses        294      268      -26     
- Partials       44       47       +3     

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[stijnmoreels]

/azp run CI - Arcus.Observability

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