[clang] [analyzer] Modernize, improve and promote chroot checker (PR #117791)

[Balazs Benics via cfe-commits]

steakhal wrote:

> @steakhal and @NagyDonat , thanks for the comments. I'll address and update the patch. Best

@vabridgers Please avoid force pushed. Prefer `merge` over `rebase` while doing the reviews. It's okay to have a sequence of commits fixing up certain behavior. Once the review is done, the PR is anyways squashed when merging. This helps to crossreference existing comments to your PR, that would GitHub loose track of every time you do a force push.

https://github.com/llvm/llvm-project/pull/117791