chore: initiate db handle warehouse slave

[cisse21]

Description

• Initiate db handle in warehouse slave
• Fix deadlock issue faced on multi-tenant production

Notion Ticket

Notion Link

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 has no change and project coverage change: +0.01 🎉

Comparison is base (e0280e4) 51.91% compared to head (fd85925) 51.93%.

❗ Current head fd85925 differs from pull request most recent head 5215560. Consider uploading reports for the commit 5215560 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3270      +/-   ##
==========================================
+ Coverage   51.91%   51.93%   +0.01%     
==========================================
  Files         322      322              
  Lines       53400    53398       -2     
==========================================
+ Hits        27721    27730       +9     
+ Misses      24024    24014      -10     
+ Partials     1655     1654       -1     

Impacted Files	Coverage Δ
...ebugger/destination/eventDeliveryStatusUploader.go	86.92% <ø> (-0.20%)	⬇️
warehouse/warehouse.go	12.79% <0.00%> (-0.16%)	⬇️

... and 9 files with indirect coverage changes

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