[NFC] Re-enable MSVC C4611 diagnostic (#182100)
From MSDN:
https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-4-c4611?view=msvc-170
I do not believe this diagnostic happens in our code base any longer.
This diagnostic was disabled in 5c73e1f85c5d37a5b037c70f3c112eec5646acb3
and the review for it (https://reviews.llvm.org/D8572) says there were
two instances of the diagnostic as of 2015. But because this is about
interaction between `setjmp` and C++ object destruction, I don't think
we need to disable this diagnostic across the entire monorepo; we can
silence it for the project using setjmp if it still exists.
I enabled the diagnostic locally and my build was warning-free but I'd
like to see how pre- (and post-)commit CI do with this one.
