fix(Auth): Moving HostedUI continuations to one place

[harsh62]

Issue #

#3362

Description

Moving the continuations at one place and thereby also removing strong retaining of the session.

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-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (a659848) 68.01% compared to head (ed193e7) 68.18%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
.../HostedUI/HostedUIASWebAuthenticationSession.swift	90.62%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3363      +/-   ##
==========================================
+ Coverage   68.01%   68.18%   +0.16%     
==========================================
  Files        1077     1077              
  Lines       35950    35950              
==========================================
+ Hits        24453    24514      +61     
+ Misses      11497    11436      -61     

Flag	Coverage Δ
API_plugin_unit_test	67.07% <ø> (ø)
AWSPluginsCore	64.59% <ø> (ø)
Amplify	47.83% <ø> (ø)
Analytics_plugin_unit_test	81.16% <ø> (ø)
Auth_plugin_unit_test	79.48% <93.18%> (-0.04%)	⬇️
CoreMLPredictions_plugin_unit_test	59.44% <ø> (ø)
DataStore_plugin_unit_test	81.07% <ø> (+0.99%)	⬆️
Geo_plugin_unit_test	70.75% <ø> (ø)
Logging_plugin_unit_test	63.09% <ø> (ø)
Predictions_plugin_unit_test	37.29% <ø> (ø)
PushNotifications_plugin_unit_test	87.03% <ø> (ø)
Storage_plugin_unit_test	78.00% <ø> (ø)
unit_tests	68.18% <93.18%> (+0.16%)	⬆️

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