[clang] [NFC][analyzer] OOB test consolidation I: no-outofbounds.c (PR #126539)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

I think we just never cleaned this up. If someone volunteered, I'd be happy to approve the restructuring PR. 

https://github.com/llvm/llvm-project/pull/126539