fix: user/anonymous id read at gateway

[Sidddddarth]

Description

Losing typecase to avoid missing out on events where userId/anonymousId is not of type string.

Notion Ticket

gateway userId read fix

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[atzoum]

shouldn't we have some test cases?

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.86 ⚠️

Comparison is base (9712cf9) 53.72% compared to head (8a0f5c6) 52.87%.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.6.x    #3051      +/-   ##
=================================================
- Coverage          53.72%   52.87%   -0.86%     
=================================================
  Files                338      338              
  Lines              54599    52120    -2479     
=================================================
- Hits               29336    27559    -1777     
+ Misses             23587    22958     -629     
+ Partials            1676     1603      -73     

Impacted Files	Coverage Δ
gateway/gateway.go	76.30% <100.00%> (-6.43%)	⬇️
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	78.26% <0.00%> (-6.66%)	⬇️
warehouse/integrations/postgres/postgres.go	26.18% <0.00%> (-5.62%)	⬇️
processor/transformer/transformer.go	74.00% <0.00%> (-5.41%)	⬇️
jobsdb/jobsdb.go	74.03% <0.00%> (-5.28%)	⬇️
regulation-worker/internal/service/service.go	73.07% <0.00%> (-5.26%)	⬇️
regulation-worker/internal/client/client.go	70.86% <0.00%> (-4.87%)	⬇️
... and 18 more

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