[llvm] [llvm-lit] Add precommit test to verify current behavior of glob expansion in lit's internal shell (PR #106325)

[via llvm-commits]

Harini0924 wrote:

@arichardson I followed your suggestion about keeping the tests in separate files to align with the current structure of the lit internal test suite. I created a file `glob-mkdir.txt` that checks if the mkdir command fails as expected when attempting to create a directory that already exists (using `example_file`). This is reflected in the `shtest-glob.py file`, where the test is expected to fail. Is this what you had in mind? Should I add or change anything else?

https://github.com/llvm/llvm-project/pull/106325