[clang] [Offload] Move HIP and CUDA to new driver by default (PR #84420)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> There are many `--no-offload-new-driver` test changes. They can be pre-committed to make this default flip modify fewer files.

I think it's much easier to keep these in a single patch, both for writing and with any potential reverting that it may require.

https://github.com/llvm/llvm-project/pull/84420