Added Trusted email validation functionality in feedback form

[ygowthamr]

PR Description: Implemented Email Domain Validation in Feedback Form

Fixes #690

1. Added validation to allow only trusted email domains: gmail.com, outlook.com, yahoo.com, protonmail.com, icloud.com, tutanota.com, and more.
2. Displays an alert message if the email is from an untrusted domain and blocks submission.
3. Ensures data integrity by filtering spam and temporary emails.

@YadavAkhileshh
Pls add level, gssoc-extd.

[github-actions[bot]]

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🎉🎉 Thank you for your contribution! Your PR #704 has been merged! 🎉🎉