Change order of event filtering mechanisms

[adinauer]

📜 Description

Event drop vs session update inconsistencies have been discussed in the Client Infra TSC. Python implementation has been updated to serve as reference implementation. We now only want to update the session when an event is dropped due to sampling but not if it is dropped due to any other filtering mechanism (beforeSend, eventProcessor, ignoredExceptionsForType). Also the order of the filtering mechanisms should be aligned across SDKs.

💡 Motivation and Context

Fixes: #1916

More Info:

• Document session update for dropped events develop#551
• Specify behaviour of session updates on dropped events develop#537
• Change ordering of event drop mechanisms sentry-python#1390
• Update session also for non sampled events and change filter order sentry-python#1394

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes (see Only send session update for dropped events if state changed #2002)
• I updated the docs if needed
• No breaking changes

🔮 Next steps

• Clarify some open questions regarding early return vs sending the session update alone

[codecov-commenter]

Codecov Report

Merging #2001 (a85eca4) into 6.x.x (4781d52) will decrease coverage by 0.01%.
The diff coverage is 90.00%.

@@             Coverage Diff              @@
##              6.x.x    #2001      +/-   ##
============================================
- Coverage     80.79%   80.77%   -0.02%     
  Complexity     3131     3131              
============================================
  Files           228      228              
  Lines         11619    11622       +3     
  Branches       1555     1556       +1     
============================================
+ Hits           9387     9388       +1     
  Misses         1648     1648              
- Partials        584      586       +2     

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SentryClient.java	87.93% <90.00%> (-0.48%)	⬇️

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