chore: enable user deletion for supported destinations

[mihir-4116]

Description

• This pr enables user deletion for iterable destination
• user deletion changes for transformer is already released, adding destination name to supportedDestinations list is pending, which is what this pr addresses

Linear Ticket

https://linear.app/rudderstack/issue/INT-607/iterable-destination-user-delete-support

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 lines are covered by tests ✅

Comparison is base (dbd4ea6) 70.49% compared to head (e592f00) 70.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3946      +/-   ##
==========================================
- Coverage   70.49%   70.35%   -0.14%     
==========================================
  Files         357      357              
  Lines       53627    53627              
==========================================
- Hits        37803    37729      -74     
- Misses      13569    13630      +61     
- Partials     2255     2268      +13     

Files	Coverage Δ
regulation-worker/internal/delete/api/api.go	65.30% <ø> (ø)

... and 12 files with indirect coverage changes

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