feat: configprovider: update context then add locale story and unit tests

[dkilgore-eightfold]

SUMMARY:

• Adds much needed ConfigProvider unit tests
• Updates IConfigContext to enhance functionality
• Adds Locale story to demonstrate basic Locale implementation and to test locales if needed
• Updates Calendar locales to include short days and short months for each lang
• Updates mocky.io url
• Removes bogus prop and type from Slider

configProviderLocales.mp4

JIRA TASK (Eightfold Employees Only):

ENG-44511

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the PR branch and run yarn, yarn test, and yarn storybook. Verify the ConfigProvider, Slider and Upload stories behave as expected.

[codesandbox-ci]

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Latest deployment of this branch, based on commit f0e69a3:

Sandbox	Source
React	Configuration
Vanilla	Configuration

[codecov-commenter]

Codecov Report

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Patch has no changes to coverable lines.

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Additional details and impacted files

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