fix(auth): add missing state transitions during auto sign in

[harsh62]

Issue #

#4082

Description

This PR adds changes to handle missing state transitions when autoSignIn() is invoked

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

❌ Patch coverage is 60.00000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.91%. Comparing base (7d06d90) to head (c8bfa78).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...achine/Resolvers/SignIn/SignInState+Resolver.swift	60.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4065      +/-   ##
==========================================
+ Coverage   66.86%   66.91%   +0.05%     
==========================================
  Files        1129     1129              
  Lines       42464    42498      +34     
==========================================
+ Hits        28393    28437      +44     
+ Misses      14071    14061      -10     

Flag	Coverage Δ
API_plugin_unit_test	68.41% <ø> (ø)
AWSPluginsCore	68.54% <ø> (ø)
Amplify	46.71% <ø> (-0.09%)	⬇️
Analytics_plugin_unit_test	84.84% <ø> (ø)
Auth_plugin_unit_test	72.47% <60.00%> (+0.09%)	⬆️
DataStore_plugin_unit_test	82.78% <ø> (+0.16%)	⬆️
Geo_plugin_unit_test	73.39% <ø> (ø)
Logging_plugin_unit_test	64.86% <ø> (ø)
Predictions_plugin_unit_test	34.24% <ø> (ø)
PushNotifications_plugin_unit_test	87.41% <ø> (ø)
Storage_plugin_unit_test	77.68% <ø> (ø)
unit_tests	66.91% <60.00%> (+0.05%)	⬆️

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