[Smart Hashing] Cleanup

[harsh-joshi99]

Cleanup for smart hashing util.
Remove destination slugs and feature flag.

Testing

Include any additional information about the testing you have completed to
ensure your changes behave as expected. For a speedy review, please check
any of the tasks you completed below during your testing.

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov]

Codecov Report

Attention: Patch coverage is 83.78378% with 12 lines in your changes missing coverage. Please review.

Project coverage is 78.11%. Comparing base (98f6a18) to head (ce08232).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/destinations/dynamic-yield-audiences/helpers.ts	60.00%	2 Missing ⚠️
...tinations/delivrai-activate/updateSegment/index.ts	66.66%	1 Missing ⚠️
.../src/destinations/dynamic-yield-audiences/index.ts	0.00%	1 Missing ⚠️
...ions/dynamic-yield-audiences/syncAudience/index.ts	0.00%	1 Missing ⚠️
...ations/reddit-conversions-api/customEvent/index.ts	50.00%	1 Missing ⚠️
...ions/reddit-conversions-api/standardEvent/index.ts	50.00%	1 Missing ⚠️
...stinations/tiktok-audiences/addToAudience/index.ts	50.00%	1 Missing ⚠️
...src/destinations/tiktok-audiences/addUser/index.ts	50.00%	1 Missing ⚠️
...tions/tiktok-audiences/removeFromAudience/index.ts	50.00%	1 Missing ⚠️
.../destinations/tiktok-audiences/removeUser/index.ts	50.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2879      +/-   ##
==========================================
+ Coverage   78.03%   78.11%   +0.07%     
==========================================
  Files        1050     1050              
  Lines       19457    19438      -19     
  Branches     3771     3734      -37     
==========================================
  Hits        15184    15184              
- Misses       2968     2972       +4     
+ Partials     1305     1282      -23     

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