chore: use stage's input payload for processor reports' sample events

[Sidddddarth]

Description

Use a stage's input payload as reports' sample events in processor.

Linear Ticket

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: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.03%. Comparing base (7818610) to head (ca4bc1f).
Report is 40 commits behind head on master.

Files with missing lines	Patch %	Lines
processor/trackingplan.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5176      +/-   ##
==========================================
+ Coverage   72.91%   73.03%   +0.11%     
==========================================
  Files         439      439              
  Lines       51138    51232      +94     
==========================================
+ Hits        37287    37415     +128     
+ Misses      11390    11365      -25     
+ Partials     2461     2452       -9     

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[github-actions]

This PR is considered to be stale. It has been open 20 days with no further activity thus it is going to be closed in 7 days. To avoid such a case please consider removing the stale label manually or add a comment to the PR.