feat(crons): Better typing on processing errors

[evanpurkhiser]

Uses typed dicts to represent the various processing errors.

[codecov]

Codecov Report

Attention: Patch coverage is 78.51852% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 58.43%. Comparing base (985c314) to head (162877e).
Report is 9 commits behind head on master.

❗ Current head 162877e differs from pull request most recent head 33ae026. Consider uploading reports for the commit 33ae026 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #70825       +/-   ##
===========================================
- Coverage   91.36%   58.43%   -32.94%     
===========================================
  Files        2862     6469     +3607     
  Lines      178863   290265   +111402     
  Branches    31910    50087    +18177     
===========================================
+ Hits       163411   169603     +6192     
- Misses      15451   120218   +104767     
- Partials        1      444      +443     

Files	Coverage Δ
src/sentry/monitors/processing_errors/manager.py	35.86% <100.00%> (-60.87%)	⬇️
src/sentry/monitors/processing_errors/errors.py	92.56% <95.41%> (-6.16%)	⬇️
src/sentry/monitors/consumers/monitor_consumer.py	19.42% <0.00%> (-71.72%)	⬇️

... and 5616 files with indirect coverage changes