Fix outstanding bugs in aggregate event recorder

[hannahhoward]

Goals

Finish off end to end aggregate events. Requires filecoin-project/lassie-event-recorder#36

[codecov-commenter]

Codecov Report

Merging #202 (e5b78d8) into main (8b1af64) will decrease coverage by 0.01%.
The diff coverage is 82.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   70.41%   70.41%   -0.01%     
==========================================
  Files          62       62              
  Lines        5229     5232       +3     
==========================================
+ Hits         3682     3684       +2     
  Misses       1348     1348              
- Partials      199      200       +1     

Impacted Files	Coverage Δ
cmd/lassie/main.go	0.00% <0.00%> (ø)
...g/aggregateeventrecorder/aggregateeventrecorder.go	89.20% <86.84%> (-1.55%)	⬇️

... and 3 files with indirect coverage changes