feat(major): [sc-6273] remove UnsafeRetained

[mr-swifter]

Description

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How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Minimal checklist:

• I have performed a self-review of my own code
• I have added DocC code-level documentation for any public interfaces exported by the package
• I have added unit and/or integration tests that prove my fix is effective or that my feature works

[shortcut-integration]

This pull request has been linked to Shortcut Story #6273: Move UnsafeRetained to package-data-model.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (478fe06) 83.72% compared to head (68ce1a8) 85.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   83.72%   85.79%   +2.07%     
==========================================
  Files          19       17       -2     
  Lines         694      584     -110     
==========================================
- Hits          581      501      -80     
+ Misses        113       83      -30     

Files	Coverage Δ
...currencyHelpersTests/ConcurrencyHelpersTests.swift	91.03% <ø> (ø)

... and 1 file with indirect coverage changes

Files	Coverage Δ
...currencyHelpersTests/ConcurrencyHelpersTests.swift	91.03% <ø> (ø)

... and 1 file with indirect coverage changes

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