[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 83.13253% with 14 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@63a977e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...rc/destinations/dynamic-yield-audiences/helpers.ts	60.00%	2 Missing ⚠️
...kages/destination-actions/src/lib/hashing-utils.ts	77.77%	1 Missing and 1 partial ⚠️
...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 ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2879   +/-   ##
=======================================
  Coverage        ?   77.97%           
=======================================
  Files           ?     1047           
  Lines           ?    19255           
  Branches        ?     3739           
=======================================
  Hits            ?    15015           
  Misses          ?     2926           
  Partials        ?     1314           

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