Update ESLint configuration

[navin772]

There are some improvements/updation that can be done for eslint:

1. babel-eslint is deprecated. Use @babel/eslint-parser instead
2. Use and test vompatibility with latest ecmaVersion (2025)
3. Add eqeqeq, prefer-const, and unused import/var checks.

Feel free to add any other improvements related to eslint parser.

[akshay11298]

Hi @navin772 , if this issue is still open, please assign this to me. I have also opened a pull request for the same mentioned above.
Thanks

[nikunj-kohli]

I would like to contribute here, I request you to assign me