[clang] [clang][analyzer] Move PutenvStackArrayChecker out of alpha package. (PR #93980)

[Balázs Kéri via cfe-commits]

balazske wrote:

I found [this one](https://codechecker-demo.eastus.cloudapp.azure.com/Default/report-detail?run=memcached_1.6.8_baseline&is-unique=off&diff-type=New&checker-name=alpha.security.PutenvStackArray&report-hash=8c8c23edbd58c25757a51f22d1a10a5a&report-id=5484388&report-filepath=%2Flocal%2Fpersistent_docker%2FCSA-measurements-driver-3175%2Fmeasurements_workspace%2Fmemcached%2Ftestapp.c) report that is a false positive. This looks not easy to fix and it is the case that is described in the documentation.

https://github.com/llvm/llvm-project/pull/93980