Fix: Graceful Shutdown flushes event instead of Closing SDK

[marandaneto]

📜 Description

Fix: Graceful Shutdown flushes event instead of Closing SDK

💡 Motivation and Context

Fix #1458

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #1500 (de02542) into main (fd64cc0) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1500      +/-   ##
============================================
+ Coverage     76.00%   76.03%   +0.02%     
- Complexity     1926     1929       +3     
============================================
  Files           191      191              
  Lines          6665     6673       +8     
  Branches        663      664       +1     
============================================
+ Hits           5066     5074       +8     
  Misses         1274     1274              
  Partials        325      325              

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SentryOptions.java	84.63% <100.00%> (+0.18%)	⬆️
...c/main/java/io/sentry/ShutdownHookIntegration.java	100.00% <100.00%> (ø)

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[bruno-garcia]

@Tyrrrz we need the same thing in .NET. Basically Dispose should only flush, particularly from Unity and ASP.NET Core and other integrations application shutdown hook where we don't guarantee we're the last thing to shut down.