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

[Alexander Richardson via llvm-commits]

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+## Tests glob pattern expansion by listing matching files.
+# RUN: echo %{inputs}/shtest-glob/example_file*.txt
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arichardson wrote:

Could also do something like `touch %t1.txt %t2.txt` and then try `mkdir %t*.txt` and check that we get two file exists errors.

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