chore: send filtered events in ut as dropped

[chandumlg]

Description

1. Fixes the issue of sending filtered events in UT to the live events as failed. With this fix, filtered events in ut are sent as dropped.
2. Stores failed events during event filtering in proc errors.

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

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (5a74b34) 70.52% compared to head (e0a15ff) 70.51%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/1.15.x    #3972      +/-   ##
==================================================
- Coverage           70.52%   70.51%   -0.01%     
==================================================
  Files                 357      357              
  Lines               53651    53660       +9     
==================================================
+ Hits                37835    37836       +1     
- Misses              13558    13565       +7     
- Partials             2258     2259       +1     

Files	Coverage Δ
jobsdb/jobsdb.go	73.23% <ø> (-0.29%)	⬇️
processor/processor.go	88.30% <100.00%> (-0.12%)	⬇️
...ger/transformation/transformationStatusUploader.go	45.11% <0.00%> (-0.87%)	⬇️

... and 11 files with indirect coverage changes

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