fix(core): Switching the HTTP Client to SDK's client engine

[harsh62]

Issue #

Description

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 1 lines in your changes are missing coverage. Please review.

Project coverage is 68.54%. Comparing base (67b69c4) to head (e06c0a0).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...ls/CustomHttpClientEngine/PluginClientEngine.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3689      +/-   ##
==========================================
+ Coverage   68.30%   68.54%   +0.24%     
==========================================
  Files        1096     1096              
  Lines       38089    38089              
==========================================
+ Hits        26017    26109      +92     
+ Misses      12072    11980      -92     

Flag	Coverage Δ
API_plugin_unit_test	68.96% <ø> (ø)
AWSPluginsCore	65.81% <0.00%> (+0.13%)	⬆️
Amplify	48.25% <ø> (+0.06%)	⬆️
Analytics_plugin_unit_test	84.52% <ø> (ø)
Auth_plugin_unit_test	79.38% <ø> (+0.09%)	⬆️
CoreMLPredictions_plugin_unit_test	61.15% <ø> (ø)
DataStore_plugin_unit_test	82.44% <ø> (+1.10%)	⬆️
Geo_plugin_unit_test	73.50% <ø> (ø)
Logging_plugin_unit_test	62.87% <ø> (ø)
Predictions_plugin_unit_test	37.31% <ø> (ø)
PushNotifications_plugin_unit_test	86.21% <ø> (ø)
Storage_plugin_unit_test	76.75% <ø> (ø)
unit_tests	68.54% <0.00%> (+0.24%)	⬆️

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