Increase the timout of iOS smoke tests

[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

Currently, the iOS smoke tests have a timeout of 10 seconds when waiting for UI elements to appear. Looking at recent failures, this value does not seem to be enough, as the UL page hasn't finished rendering by the time this timeout expires:

This PR raises the timeout to 30m seconds to give the UL page enough time to finish rendering.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (feature/macos-support@19afea6). Click here to learn what that means.

Additional details and impacted files

@@                   Coverage Diff                    @@
##             feature/macos-support     #359   +/-   ##
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  Coverage                         ?   96.36%           
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  Files                            ?       98           
  Lines                            ?     1596           
  Branches                         ?      328           
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  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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