Remove csv in custom data

[rkspx]

• remove erroneous implementation for splitting custom data value by comma

[codecov[bot]]

Codecov Report

Base: 96.52% // Head: 96.51% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (d138f44) compared to base (5d83e2a). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
- Coverage   96.52%   96.51%   -0.01%     
==========================================
  Files          45       45              
  Lines        3219     3215       -4     
==========================================
- Hits         3107     3103       -4     
  Misses         84       84              
  Partials       28       28              

Impacted Files	Coverage Δ
internal/pkg/dsiem/rule/rule.go	100.00% <ø> (ø)

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