[clang] [Sema] Fix c23 not checking CheckBoolLikeConversion (PR #79588)

[Pil Eghoff via cfe-commits]

pileghoff wrote:

> Thank you for the Fix! Your summary should be a description of the problem and how your solution fixes that problem. You should also link to the github issue in the summary.
> 
> Questions about the changes in the PR should go as a comment to the PR.
> 
> Please add a release note and this will need tests as well.

Noted. I have updated the description.

With regards to testing, I think I get how to write them, but I'm still unsure about where I'm suppose to put them. Would a new file (`implicit-boolike-conversion.c`?) be appropriate? 

Is the PR requirements/process documented anywhere? I had a look at [here](https://llvm.org/docs/Contributing.html) and i was looking around if there was a template, but i have found nothing.

https://github.com/llvm/llvm-project/pull/79588