feat: add autocomplete attributes for MFA input

[Kadxy]

What this PR does / why we need it?

This improvement allows password managers to detect the field as a OTP input and allows auto-fill the verification code directly from the browser extension or keyboard suggestions.

Summary of your change

Add autocomplete="one-time-code" to the MFA login input field in frontend/src/views/login/components/login-form.vue.

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[Copilot]

Pull request overview

This PR enhances the MFA login experience by adding the autocomplete="one-time-code" attribute to the MFA verification code input field. This allows password managers and browser extensions to automatically detect and autofill OTP codes.

• Add autocomplete="one-time-code" attribute to the MFA input field for better browser integration

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