Develop/tasks/td 7672 implement phase 3 enforce email login

[swapnamol-abraham]

JIRA link

TD-7672

Description

Implement Phase 3 - enforce email login -
Prevented successful username sign-in while clearly directing users to retry using their email address

Screenshots

Attach screenshots on mobile, tablet and desktop.

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Developer checks

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I have:

• Run the formatter and made sure there are no IDE errors
• Written appropriate unit tests for the changes
• Manually tested my work with and without JavaScript
• Tested any Views or partials created or changed with Wave Chrome plugin and addressed any valid accessibility issues
• Updated/added documentation in Confluence and/or GitHub Readme. List of documentation links added/changed:
  • doc_1_here
• Updated my Jira ticket with information about other parts of the system that were touched as part of the MR and have to be sanity tested to ensure nothing is broken
• Scanned over my pull request in GitHub and addressed any warnings from the GitHub Build and Test checks.