fix: don't send error in stats

[achettyiitr]

Description

• Don't send errors in the stats as it can increase the cardinality.

Linear Ticket

• Resolves PIPE-465

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d2db45) 71.52% compared to head (9d2d8c2) 71.79%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4055      +/-   ##
==========================================
+ Coverage   71.52%   71.79%   +0.27%     
==========================================
  Files         373      373              
  Lines       54838    54837       -1     
==========================================
+ Hits        39224    39372     +148     
+ Misses      13275    13149     -126     
+ Partials     2339     2316      -23     

Files	Coverage Δ
enterprise/reporting/error_index/types.go	42.85% <ø> (ø)
warehouse/router/router.go	88.14% <100.00%> (+0.56%)	⬆️

... and 12 files with indirect coverage changes

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