fix(auth): add localized description to AWSCognitoAuthError

[harsh62]

Issue #

Description

Add localized description to the AWSCognitoAuthError to avoid any confusion where system makes a description itself.

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

Attention: Patch coverage is 0% with 74 lines in your changes missing coverage. Please review.

Project coverage is 67.67%. Comparing base (ed263d7) to head (98f09f0).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...AuthPlugin/Models/Errors/AWSCognitoAuthError.swift	0.00%	74 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3929      +/-   ##
==========================================
- Coverage   67.79%   67.67%   -0.12%     
==========================================
  Files        1124     1125       +1     
  Lines       51984    52075      +91     
==========================================
  Hits        35242    35242              
- Misses      16742    16833      +91     

Flag	Coverage Δ
API_plugin_unit_test	70.33% <ø> (ø)
AWSPluginsCore	70.36% <ø> (ø)
Amplify	47.89% <ø> (ø)
Analytics_plugin_unit_test	85.20% <ø> (ø)
Auth_plugin_unit_test	73.43% <0.00%> (-0.35%)	⬇️
DataStore_plugin_unit_test	83.29% <ø> (-0.15%)	⬇️
Geo_plugin_unit_test	74.86% <ø> (ø)
Logging_plugin_unit_test	63.11% <ø> (ø)
Predictions_plugin_unit_test	35.49% <ø> (ø)
PushNotifications_plugin_unit_test	88.43% <ø> (ø)
Storage_plugin_unit_test	76.88% <ø> (ø)
unit_tests	67.67% <0.00%> (-0.12%)	⬇️

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