fix: change retl check to source category

[cisse21]

Description

Replace the check for validating an rETL event from comparing sourceJobRunId(which can also appear in a replay) to sourceCategory

Linear Ticket

Fixes PIPE-1606

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 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.90%. Comparing base (f329d38) to head (72d5bce).
Report is 1 commits behind head on release/1.35.x.

Files with missing lines	Patch %	Lines
router/worker.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/1.35.x    #5167      +/-   ##
==================================================
- Coverage           72.90%   72.90%   -0.01%     
==================================================
  Files                 439      439              
  Lines               51165    51165              
==================================================
- Hits                37304    37301       -3     
- Misses              11405    11407       +2     
- Partials             2456     2457       +1     

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