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

[Tom Eccles via flang-commits]

tblah wrote:

I'm not entirely against this, but I do currently find these tests useful when reviewing driver patches. They do make it easier to confirm my understanding of exactly what is being changed.

If others want to see this change then I won't oppose it

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