added the cleanup in emailVerfication

[Deepanshu1230]

Description

Added effect cleanup in EmailVerification component by storing the setTimeout return value and clearing it in the useEffect cleanup function.

Type of change

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Chore (refactoring, dependency updates, CI/CD changes, code cleanup, docs-only changes).

Checklist

Formalities

• I have read and understood the rules about how to Contribute to this project.
• I chose an appropriate title for the pull request in the form: Add effect cleanup in EmailVerification. Closes #[issue number]
• My branch is based on develop.
• The pull request is for the branch develop.
• I have reviewed and verified any LLM-generated code included in this PR.

Docs and tests

• I documented my code changes with docstrings and/or comments.
• I have checked if my changes affect user-facing behavior — they do not.
• Linter (Ruff) gave 0 errors.
• I have added tests for the feature/bug I solved — no new tests required, existing tests pass.
• All the tests gave 0 errors.

Closes issue #1252

[Copilot]

Pull request overview

This PR aims to fix issue #1252 by adding missing useEffect cleanup logic in the EmailVerification component to prevent a scheduled setTimeout from firing after the effect is torn down.

Changes:

• Store the setTimeout ID when scheduling the email verification call.
• Clear the timeout in the useEffect cleanup function when the effect is cleaned up.

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[regulartim]

Looks good, thanks! :)