fix(Auth): Fixing a retain cycle when configuring Auth and listening for updates

[ruisebas]

Description

This PR addresses a retain cycle that happened when the Auth plugin was added due to the fact that Task retains self and we were iterating through a never-ending AsyncSequence.

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
  • https://github.com/aws-amplify/amplify-swift/actions/runs/8574210531
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.52%. Comparing base (946600a) to head (5ddf2a7).
Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3599      +/-   ##
==========================================
- Coverage   68.53%   68.52%   -0.01%     
==========================================
  Files        1084     1084              
  Lines       36975    36975              
==========================================
- Hits        25339    25338       -1     
- Misses      11636    11637       +1     

Flag	Coverage Δ
API_plugin_unit_test	67.82% <ø> (ø)
AWSPluginsCore	68.64% <ø> (ø)
Amplify	48.21% <ø> (ø)
Analytics_plugin_unit_test	81.16% <ø> (ø)
Auth_plugin_unit_test	79.03% <100.00%> (+0.02%)	⬆️
CoreMLPredictions_plugin_unit_test	59.44% <ø> (ø)
DataStore_plugin_unit_test	82.33% <ø> (-0.06%)	⬇️
Geo_plugin_unit_test	70.75% <ø> (ø)
Logging_plugin_unit_test	62.87% <ø> (ø)
Predictions_plugin_unit_test	37.10% <ø> (ø)
PushNotifications_plugin_unit_test	87.13% <ø> (ø)
Storage_plugin_unit_test	77.61% <ø> (ø)
unit_tests	68.52% <100.00%> (-0.01%)	⬇️

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