ci: temporarily disable litbot checkgroup

[deependujha]

What does this PR do?

Fixes #<issue_number>
Since litbot oss is not running right now, probot's checkgroup gets LitJob's status to be: 'no_status', assumes CI is still running and eventually fails after timeout. So temporarily disabling it.

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📚 Documentation preview 📚: https://pytorch-lightning--21713.org.readthedocs.build/en/21713/

[bhimrazy]

I think it might not be a good idea to disable it on the master branch, as we could end up blindly merging PRs without GPU test results.

Maybe we should first discuss the way forward for GPU testing and then act accordingly based on that decision.
fyi: @deependujha @justusschock @ethanwharris

[deependujha]

Completely agree with u @bhimrazy. Still there’s been almost no update on master branch, multiple bump prs, chore fixes, doc fixes, etc have also not landed since 2-3 weeks.

IMO it just comes down to what is the expected time of availability for litbot.

[justusschock]

While i don't like this, i think it's the way to unblock local development for now. It just means that we won't do a new major release until we have GPU CI working again.