chore: update event_delivery_time histogram buckets

[itsmihir]

Description

add 30h, 36h bucket in event_delivery_time metric

Linear Ticket

Resolves OBS-700
https://linear.app/rudderstack/issue/OBS-700/add-30h-36h-bucket-in-event-delivery-time-metric

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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.04%. Comparing base (e7cccae) to head (1c9ca2d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5186      +/-   ##
==========================================
+ Coverage   72.94%   73.04%   +0.10%     
==========================================
  Files         439      439              
  Lines       51139    51139              
==========================================
+ Hits        37302    37355      +53     
+ Misses      11380    11338      -42     
+ Partials     2457     2446      -11     

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