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

[Balazs Benics via cfe-commits]

================
@@ -992,6 +992,241 @@ optin.portability.UnixAPI
 """""""""""""""""""""""""
 Finds implementation-defined behavior in UNIX/Posix functions.
 
+
+optin.taint
+^^^^^^^^^^^^^^^^^^^^
----------------
steakhal wrote:

```suggestion
optin.taint
^^^^^^^^^^^
```

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