[clang] [analyzer] Removing untrusted buffer size taint warning (PR #68607)

[via cfe-commits]

https://github.com/DonatNagyE commented:

See  https://github.com/llvm/llvm-project/pull/67352 for the discussion and test results that motivated this patch. This is a conservative change that'll remove some bug reports (both TPs and FPs) and would let us move the generic taint checker out of the current alpha stage. After that, we would be able to recover the lost TPs with follow-up commits that extend MallocChecker and CStringChecker.

There were some trivial grammar/formatting issues, I marked them with inline comments.

https://github.com/llvm/llvm-project/pull/68607