Only send session update for dropped events if state changed

[adinauer]

📜 Description

Extra for #2001 to only send session update for dropped events if session state changed (healty -> errored or errored -> crashed).

💡 Motivation and Context

See linked PR for more context. This should ensure session updates make it to the server for dropped events that changed the session state.

💚 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

• Add tests

[codecov-commenter]

Codecov Report

Merging #2002 (bba94ea) into fix/event-drop-session-update-inconsistencies (a85eca4) will increase coverage by 0.01%.
The diff coverage is 91.30%.

@@                                 Coverage Diff                                 @@
##             fix/event-drop-session-update-inconsistencies    #2002      +/-   ##
===================================================================================
+ Coverage                                            80.77%   80.79%   +0.01%     
- Complexity                                            3131     3146      +15     
===================================================================================
  Files                                                  228      228              
  Lines                                                11622    11642      +20     
  Branches                                              1556     1565       +9     
===================================================================================
+ Hits                                                  9388     9406      +18     
- Misses                                                1648     1649       +1     
- Partials                                               586      587       +1     

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SentryClient.java	87.77% <91.30%> (-0.16%)	⬇️
sentry/src/main/java/io/sentry/ISentryClient.java	90.90% <0.00%> (+4.54%)	⬆️

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[bruno-garcia]

lgtm