feat: DIA-2131: Capture num failed predictions sent to LSE

[hakan458]

Added num_failed_predictions to batch-failed-predictions post request, to be able to capture in metabase

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.16%. Comparing base (cfbff47) to head (c231c5b).

Files with missing lines	Patch %	Lines
server/handlers/result_handlers.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #372      +/-   ##
==========================================
- Coverage   69.18%   69.16%   -0.03%     
==========================================
  Files          49       49              
  Lines        2856     2857       +1     
==========================================
  Hits         1976     1976              
- Misses        880      881       +1     

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