Use SentryId for ISession.Id

[Tyrrrz]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1052 (b0a2f47) into main (5a573c9) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1052      +/-   ##
==========================================
- Coverage   81.42%   81.39%   -0.04%     
==========================================
  Files         193      193              
  Lines        6325     6325              
  Branches     1526     1526              
==========================================
- Hits         5150     5148       -2     
  Misses        739      739              
- Partials      436      438       +2     

Impacted Files	Coverage Δ
src/Sentry/Internal/Http/HttpTransport.cs	89.85% <100.00%> (ø)
src/Sentry/Session.cs	100.00% <100.00%> (ø)
src/Sentry/SessionUpdate.cs	93.26% <100.00%> (ø)
src/Sentry/GlobalSessionManager.cs	64.03% <0.00%> (-0.88%)	⬇️
src/Sentry/Internal/BackgroundWorker.cs	84.24% <0.00%> (-0.69%)	⬇️

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