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

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

I have no concerns with moving forward here, my understanding is that the blockers have been resolved. Moreover, we are early in the development cycle for the next release so we still have a lot of time to get more experience with this check once it is move out of alpha. But I'd also wait for Artem to greenlight this.

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