Prevent clearing shared keychains

[tylerjroach]

Issue #

#4076

Description

This change prevents shared Keychains (accessGroup) from being cleared on a fresh install. Since UserDefaults are not shared across apps/extensions, we have no reliable way to determine if this is the first launch of all apps/extensions that are using the provided accessGroup.

The caveat here is that if a user uninstalls and reinstalls an application, the credentials will not be wiped like they are in the standard, non shared Keychain usage. This change is necessary though given the above 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.17%. Comparing base (da37c22) to head (e87faf8).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4077      +/-   ##
==========================================
+ Coverage   68.03%   68.17%   +0.14%     
==========================================
  Files        1129     1129              
  Lines       54487    54493       +6     
==========================================
+ Hits        37068    37151      +83     
+ Misses      17419    17342      -77     

Flag	Coverage Δ
API_plugin_unit_test	70.17% <ø> (+0.02%)	⬆️
AWSPluginsCore	69.50% <ø> (ø)
Amplify	47.88% <ø> (-0.02%)	⬇️
Analytics_plugin_unit_test	85.59% <ø> (ø)
Auth_plugin_unit_test	73.71% <100.00%> (+0.07%)	⬆️
DataStore_plugin_unit_test	84.44% <ø> (+0.69%)	⬆️
Geo_plugin_unit_test	75.95% <ø> (ø)
Logging_plugin_unit_test	65.56% <ø> (ø)
Predictions_plugin_unit_test	34.59% <ø> (ø)
PushNotifications_plugin_unit_test	88.76% <ø> (ø)
Storage_plugin_unit_test	78.90% <ø> (ø)
unit_tests	68.17% <100.00%> (+0.14%)	⬆️

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