fix(Auth): Resolve AuthZ state correctly when in error state

[harsh62]

Description

The issue aims to fix a use case where if the AuthPlugin was initialized into an error state. This resulted in subsequent fetchAuthSession to fail due to an error state not handled correctly.

Scenario:

• Initialize Amplify and call fetchAuthSession API while offline.
• Observe Amplify throwing the correct service error
• Go back online and call the fetchAuthSession API again.

Expected: the API to return results
Bug: The API returned a service error that was previously cached.

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
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.44%. Comparing base (9ed6c1c) to head (f494bef).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3762      +/-   ##
==========================================
+ Coverage   68.43%   68.44%   +0.01%     
==========================================
  Files        1079     1079              
  Lines       37573    37571       -2     
==========================================
+ Hits        25712    25717       +5     
+ Misses      11861    11854       -7     

Flag	Coverage Δ
API_plugin_unit_test	68.83% <ø> (ø)
AWSPluginsCore	68.56% <ø> (+0.14%)	⬆️
Amplify	47.59% <ø> (-0.07%)	⬇️
Analytics_plugin_unit_test	84.52% <ø> (ø)
Auth_plugin_unit_test	79.47% <100.00%> (+0.11%)	⬆️
DataStore_plugin_unit_test	81.23% <ø> (-0.06%)	⬇️
Geo_plugin_unit_test	72.00% <ø> (ø)
Logging_plugin_unit_test	62.95% <ø> (ø)
Predictions_plugin_unit_test	37.32% <ø> (ø)
PushNotifications_plugin_unit_test	86.21% <ø> (ø)
Storage_plugin_unit_test	76.75% <ø> (ø)
unit_tests	68.44% <100.00%> (+0.01%)	⬆️

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