[clang] [analyzer] Moving TaintPropagation checker out of alpha (PR #67352)

[Artem Dergachev via cfe-commits]

haoNoQ wrote:

(Yeah we still have those false positives, though `memset` isn't actually covered yet as a potential sink: https://godbolt.org/z/6h5x87vMc)

https://github.com/llvm/llvm-project/pull/67352