fix: setup in Lightning Studio by uninstalling pre-installed lightning package

[deependujha]

What does this PR do?

Fixes #<issue_number>

Running make setup on Lightning Studio doesn't work as intended, because the environment already includes a pre-installed lightning package.

This PR resolves the issue by uninstalling the existing package before setup, ensuring a clean installation process.

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📚 Documentation preview 📚: https://pytorch-lightning--21275.org.readthedocs.build/en/21275/