[clang-tools-extra] [clang-tidy][NFC] Enable 'readability-simplify-boolean-expr' check (PR #158706)

[Baranov Victor via cfe-commits]

vbvictor wrote:

> > > What do others think?
> > 
> > I agree, I have somewhat mixed feelings about this rule. Also negating conditions to make them more optimal/short can also lead to worse readability. I believe this is alleviated by setting `SimplifyDeMorgan` to `false`.
> 
> I will do some experimentation the config options

If we get unsatisfying results with it, we should think about making this check less aggressive (via new options) and leave this check disabled for now (But we could merge good transformations from it)



https://github.com/llvm/llvm-project/pull/158706