disable autocompletion on login form

[taoufiqaitali]

Description (*)

The form in authentication-popup.html uses autocompletion, which allows some browsers to retain sensitive information in their history.Autocompletion of forms allows some browsers to retain sensitive information in their history.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @taoufiqaitali. Thank you for your contribution!
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