IHub.ResumeSession(): don't start a new session if pause wasn't called or if there is no active session

[Tyrrrz]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1089 (219431b) into main (9a07c9a) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1089      +/-   ##
==========================================
+ Coverage   80.65%   80.70%   +0.04%     
==========================================
  Files         194      194              
  Lines        6354     6359       +5     
  Branches     1409     1411       +2     
==========================================
+ Hits         5125     5132       +7     
  Misses        764      764              
+ Partials      465      463       -2     

Impacted Files	Coverage Δ
src/Sentry/GlobalSessionManager.cs	66.66% <100.00%> (+1.91%)	⬆️
src/Sentry/Internal/Hub.cs	69.35% <100.00%> (+0.67%)	⬆️

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