[clang] [Clang][Sema]: Diagnose lambda to bool implicit casts (PR #83152)

[Vinayak Dev via cfe-commits]

vinayakdsci wrote:

@AaronBallman sorry for repeating the same mistake twice, I was unable to correctly interpret what you wanted to say when you meant removing the lambda body from the diagnostic.
I have made all the suggested changes and updated the tests. I hope I don't come across as dumb :-) ! I will be more mindful of what changes I have made before pushing them to the remote in the future.

Thanks!

https://github.com/llvm/llvm-project/pull/83152