Fix iOS coverage reporting

[Widcket]

Description

This PR fixes the iOS coverage reporting:

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[codecov]

Codecov Report

Merging #139 (4fbaf5a) into first-availability (b38e776) will increase coverage by 2.70%.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##             first-availability     #139      +/-   ##
========================================================
+ Coverage                 93.31%   96.02%   +2.70%     
  Complexity                   69       69              
========================================================
  Files                        51       75      +24     
  Lines                       793     1384     +591     
  Branches                     43      294     +251     
========================================================
+ Hits                        740     1329     +589     
  Misses                       46       46              
- Partials                      7        9       +2     

Flag	Coverage Δ
auth0_flutter	100.00% <ø> (ø)
auth0_flutter_android	90.49% <ø> (ø)
auth0_flutter_ios	99.66% <ø> (?)
auth0_flutter_platform_interface	96.66% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/Classes/AuthAPI/AuthAPISignupMethodHandler.swift	100.00% <0.00%> (ø)
...os/Classes/WebAuth/WebAuthLoginMethodHandler.swift	100.00% <0.00%> (ø)
...dentialsManager/CredentialsManagerExtensions.swift	93.75% <0.00%> (ø)
...0_flutter/ios/Classes/WebAuth/WebAuthHandler.swift	100.00% <0.00%> (ø)
auth0_flutter/ios/Classes/Extensions.swift	100.00% <0.00%> (ø)
.../CredentialsManager/CredentialsManagerModels.swift	100.00% <0.00%> (ø)
...lsManager/CredentialsManagerGetMethodHandler.swift	95.00% <0.00%> (ø)
...CredentialsManager/CredentialsManagerHandler.swift	100.00% <0.00%> (ø)
auth0_flutter/ios/Classes/HandlerError.swift	100.00% <0.00%> (ø)
...API/AuthAPILoginUsernameOrEmailMethodHandler.swift	100.00% <0.00%> (ø)
... and 14 more

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