[clang] [analyzer] Bring unix.cstring.UninitializedRead checker out of alpha (PR #196292)

[Endre Fülöp via cfe-commits]

gamesh411 wrote:

@NagyDonat, it seems that the last batch did not have ffmpeg and vim enabled (which is unfortunate because those are the only ones that have reports for this checker).
We have the true positives from ffmpeg still: https://codechecker-demo.eastus.cloudapp.azure.com/Default/reports?review-status=Unreviewed&review-status=Confirmed%20bug&detection-status=New&detection-status=Reopened&detection-status=Unresolved&run=ffmpeg_n7.1.1_zfulend_UninitializedRead_dealpha2&is-unique=on&diff-type=New&checker-name=alpha.unix.cstring.UninitializedRead
and vim as well:
https://codechecker-demo.eastus.cloudapp.azure.com/Default/reports?review-status=Unreviewed&review-status=Confirmed%20bug&detection-status=New&detection-status=Reopened&detection-status=Unresolved&run=vim_v9.1.1232_zfulend_UninitializedRead_dealpha2&is-unique=off&diff-type=New&checker-name=alpha.unix.cstring.UninitializedRead


https://github.com/llvm/llvm-project/pull/196292