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

[Tom Eccles via flang-commits]

tblah wrote:

Yeah I agree that we need "proper" testing in addition to these. I am happy to merge if nobody else raises objections over the next few days.

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