[flang-commits] [flang] [flang][driver] Remove `flang -help` tests (PR #89504)

[Michael Kruse via flang-commits]

Meinersbur wrote:

As @banach-space already brought up, I don't think these add much value. They are effectively just testing the print-loop over all options correctly considers the `FlangOption` flag. There's not much that can go wrong there, part of the documentation (should we also regression-test the Sphinx/DocBrief output?), but a chore to update.

https://github.com/llvm/llvm-project/pull/89504