logging and additional fallback for installation ID

[Tyrrrz]

I don't know what other logs I can add, this sequence is incredibly trivial. I did add Environment.MachineName as fallback, which should hopefully work x-platform.

[codecov-commenter]

Codecov Report

Merging #1103 (72b2f9e) into main (4fe2084) will increase coverage by 0.12%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main    #1103      +/-   ##
==========================================
+ Coverage   80.84%   80.97%   +0.12%     
==========================================
  Files         195      195              
  Lines        6400     6406       +6     
  Branches     1413     1414       +1     
==========================================
+ Hits         5174     5187      +13     
+ Misses        764      755       -9     
- Partials      462      464       +2     

Impacted Files	Coverage Δ
src/Sentry/GlobalSessionManager.cs	66.66% <87.50%> (ø)
src/Sentry/Internal/Extensions/HashExtensions.cs	100.00% <0.00%> (+100.00%)	⬆️

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[github-actions]

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