fix(auth): configure with standardAttributes snake case values

[lawmicha]

Issue #

Description

There is a customization to the decoder that takes snake case and converts it to camel case. This works for property keys, but not the values themselves. This was a miss in translating the cognito standard attributes over to the enum without the exact value, in snake case.

Schema of the enum values: https://github.com/aws-amplify/amplify-backend/blob/main/packages/client-config/src/client-config-schema/schema_v1.json#L347-L370

"amazon_cognito_standard_attributes": {
      "description": "Amazon Cognito standard attributes for users -- https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html",
      "type": "string",
      "enum": [
        "address",
        "birthdate",
        "email",
        "family_name",
        "gender",
        "given_name",
        "locale",
        "middle_name",
        "name",
        "nickname",
        "phone_number",
        "picture",
        "preferred_username",
        "profile",
        "sub",
        "updated_at",
        "website",
        "zoneinfo"
      ]
    },

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.

[harsh62]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.53%. Comparing base (668095a) to head (188c428).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3686      +/-   ##
==========================================
+ Coverage   67.46%   68.53%   +1.07%     
==========================================
  Files         984     1096     +112     
  Lines       33409    38089    +4680     
==========================================
+ Hits        22539    26106    +3567     
- Misses      10870    11983    +1113     

Flag	Coverage Δ
API_plugin_unit_test	68.96% <ø> (ø)
AWSPluginsCore	65.67% <ø> (ø)
Amplify	48.25% <ø> (+0.04%)	⬆️
Analytics_plugin_unit_test	84.52% <ø> (?)
Auth_plugin_unit_test	79.37% <ø> (+0.08%)	⬆️
CoreMLPredictions_plugin_unit_test	61.15% <ø> (ø)
DataStore_plugin_unit_test	82.45% <ø> (+1.04%)	⬆️
Geo_plugin_unit_test	73.50% <ø> (ø)
Logging_plugin_unit_test	62.87% <ø> (?)
Predictions_plugin_unit_test	37.31% <ø> (ø)
PushNotifications_plugin_unit_test	86.21% <ø> (ø)
Storage_plugin_unit_test	76.75% <ø> (?)
unit_tests	68.53% <ø> (+1.07%)	⬆️

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