af: Update symlinks script to use relative path from symlink location

[Widcket]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

flutter pub publish errors with the current symlinks. This PR updates the generate-symlinks.sh script to use the relative path from the symlink's location, and includes the regenerated symlinks.

With these changes, flutter pub publish --dry-run does not error anymore.

🎯 Testing

The changes were tested manually with both the QS sample app, and the example app included in this repository.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (253209a) 96.08% compared to head (32f6918) 96.30%.
Report is 39 commits behind head on main.

Files	Patch %	Lines
...lutter/darwin/Classes/AuthAPI/AuthAPIHandler.swift	98.00%	0 Missing and 1 partial ⚠️
...in/Classes/WebAuth/WebAuthLoginMethodHandler.swift	98.48%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #388      +/-   ##
============================================
+ Coverage     96.08%   96.30%   +0.21%     
============================================
  Files            97       98       +1     
  Lines          1611     1596      -15     
  Branches        331      340       +9     
============================================
- Hits           1548     1537      -11     
- Misses           49       50       +1     
+ Partials         14        9       -5     

Flag	Coverage Δ
auth0_flutter	100.00% <100.00%> (ø)
auth0_flutter_android	97.35% <ø> (+0.79%)	⬆️
auth0_flutter_ios	99.70% <99.70%> (-0.15%)	⬇️
auth0_flutter_platform_interface	87.03% <100.00%> (ø)

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