[clang] Diagnose the code with trailing comma in the function call. (PR #125232)

[Haojian Wu via cfe-commits]

hokein wrote:

> @hokein feel free to merge :)

Thanks for the ping.

We have several instances of `func(1,);` in our internal codebase, and the number is not small unfortunately. I'm currently working on a cleanup, which will take some time. I plan to merge this patch as soon as the cleanup is complete (ETA: by the end of this week).  

Additionally, we will need to backport this fix to the `release20` branch.  

https://github.com/llvm/llvm-project/pull/125232