Refactor Password Reset: Convert Class-Based Component to Functional Component

[Manik-Khajuria-5]

Issue number

Contributes to #4460

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Description

This PR refactors the PasswordReset component by converting it from a legacy class-based React component into a modern functional component using React hooks.

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Key Changes

• Converted PasswordReset from a class-based component to a functional component
• Replaced lifecycle methods with useEffect for handling success state updates
• Simplified internal state management using useState
• Removed deprecated patterns such as constructors and manual this bindings
• Preserved existing password reset logic and integration with setInitialPassword
• Maintained support for both username- and email-based authentication
• Improved readability and consistency with modern Volto code style

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• I verified there aren't other open pull requests for the same change.
• I followed the guidelines in Contributing to Volto.
• I successfully ran code linting checks on my changes locally.
• I successfully ran unit tests on my changes locally.
• I successfully ran acceptance tests on my changes locally.
• If needed, I added new tests for my changes.
• If needed, I added documentation for my changes, either in the Storybook or narrative documentation.
• I included a change log entry in my commits.

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