af: Use symlinks with relative paths 2/2

[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

The symlinks had been generated using absolute paths, which is incorrect. This PR re-generates them correctly, and modifies the generation script so that the Podspec also gets copied instead of symlinked.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (macos-support/ci-check-symlinks@ea59acb). Click here to learn what that means.

Additional details and impacted files

@@                        Coverage Diff                         @@
##             macos-support/ci-check-symlinks     #353   +/-   ##
==================================================================
  Coverage                                   ?   96.36%           
==================================================================
  Files                                      ?       98           
  Lines                                      ?     1596           
  Branches                                   ?      328           
==================================================================
  Hits                                       ?     1538           
  Misses                                     ?       50           
  Partials                                   ?        8           

Flag	Coverage Δ
auth0_flutter	100.00% <0.00%> (?)
auth0_flutter_android	97.35% <0.00%> (?)
auth0_flutter_ios	99.85% <0.00%> (?)
auth0_flutter_platform_interface	87.03% <0.00%> (?)

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