[llvm] [llvm-debuginfod] Update tests to work with internal shell (PR #158141)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

(Not caught before landing the patch to turn on the internal shell by default because of the dependencies that are needed to run these tests. There are also no upstream buildbots currently with the dependencies necessary to run these tests).

Everything checks out for me locally though when running `check-llvm-tools-llvm-debuginfod` and `check-llvm-tools-llvm-debuginfod-find` (and none are marked UNSUPPORTED).

https://github.com/llvm/llvm-project/pull/158141