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

[Paul Kirth via llvm-commits]

https://github.com/ilovepi approved this pull request.

LGTM as long as bots are happy. I'll land this for you once those pass and @jh7370 is satisfied.

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