chore(cleanup): Remove show_apple_in_cab feature gate

[finnian0826]

Description

Title

Test plan

CI

Related issues

• Part of ACT-1443

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.01%. Comparing base (144241a) to head (235e926).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6302      +/-   ##
==========================================
- Coverage   89.01%   89.01%   -0.01%     
==========================================
  Files         739      739              
  Lines       31604    31598       -6     
  Branches     5571     5876     +305     
==========================================
- Hits        28132    28126       -6     
+ Misses       3427     3274     -153     
- Partials       45      198     +153     

Files with missing lines	Coverage Δ
src/keylessBackup/SignInWithEmail.tsx	98.09% <100.00%> (-0.09%)	⬇️
src/statsig/types.ts	100.00% <ø> (ø)

... and 66 files with indirect coverage changes

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