feat: drop rate-limited events

[giortzisg]

Description

To avoid filling up the buffer queues when rate-limited, we should be dropping events that got selected for processing. This is a behavioral change, since both the new and old transports/scheduler were just skipping the event without dropping.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.81%. Comparing base (a2066ef) to head (a363a28).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1138      +/-   ##
==========================================
+ Coverage   86.78%   86.81%   +0.03%     
==========================================
  Files          62       62              
  Lines        6092     6092              
==========================================
+ Hits         5287     5289       +2     
+ Misses        590      589       -1     
+ Partials      215      214       -1     

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[cleptric]

Should note somewhere that we need client reports for this.