[clang] [llvm] [analyzer] Delete `alpha.security.MallocOverflow` (PR #103059)

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vabridgers wrote:

I agree with Donat's proposal to remove this check, especially if the taint checker can be used to detect a "tainted" argument to an equivalent malloc() function. We see many false positives with the approach used in this checker to the extent that devs disable this checker. 

LGTM, but someone else must approve. Thanks

https://github.com/llvm/llvm-project/pull/103059