[llvm] [llvm-lit] Resolve env subcommand required error (PR #98414)

[Thomas Preud'homme via llvm-commits]

RoboTux wrote:

There's still lots of lint changes on lines not modified by this PR. Try clang-format-diff or git-clang-format to only format lines you have changed.

https://github.com/llvm/llvm-project/pull/98414