fix: payload limiter gauge reports invalid value type

[Sidddddarth]

Description

Using proper numeric values (non-custom types) for limiter stats. Fixes #3046

Notion Ticket

ref github issue

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

Patch coverage: 100.00% and project coverage change: -0.84 ⚠️

Comparison is base (9712cf9) 53.72% compared to head (2917caf) 52.89%.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.6.x    #3048      +/-   ##
=================================================
- Coverage          53.72%   52.89%   -0.84%     
=================================================
  Files                338      338              
  Lines              54599    52131    -2468     
=================================================
- Hits               29336    27575    -1761     
+ Misses             23587    22953     -634     
+ Partials            1676     1603      -73     

Impacted Files	Coverage Δ
utils/payload/limiter_setup.go	87.27% <100.00%> (+3.18%)	⬆️
regulation-worker/internal/delete/batch/batch.go	50.56% <0.00%> (-7.93%)	⬇️
jobsdb/unionQuery.go	84.13% <0.00%> (-7.03%)	⬇️
router/router.go	78.08% <0.00%> (-6.85%)	⬇️
gateway/gateway.go	76.30% <0.00%> (-6.43%)	⬇️
warehouse/integrations/postgres/postgres.go	26.18% <0.00%> (-5.62%)	⬇️
processor/transformer/transformer.go	74.00% <0.00%> (-5.41%)	⬇️
jobsdb/jobsdb.go	73.91% <0.00%> (-5.40%)	⬇️
regulation-worker/internal/service/service.go	73.07% <0.00%> (-5.26%)	⬇️
utils/misc/misc.go	50.05% <0.00%> (-4.90%)	⬇️
... and 20 more

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