skip conda-python-tests on arm64

[jameslamb]

All of this repo's conda-python-tests jobs have conditions in them like "skip on ARM":

cugraph-gnn/ci/test_python.sh

Line 100 in 2dd3001

rapids-logger "skipping cugraph_dgl pytest on ARM64"

cugraph-gnn/ci/test_python.sh

Line 141 in 2dd3001

rapids-logger "skipping cugraph_pyg pytest on ARM64"

cugraph-gnn/ci/test_python.sh

Line 183 in 2dd3001

rapids-logger "skipping pylibwholegraph pytest on ARM64"

As a result, right now the arm64 conda-python-tests jobs are just wasting CI resources... they're spending 40+ 5-10 minutes occupying a GPU runner just to download some datasets and then exit (example build link).

This proposes never even starting those jobs, to make CI here less expensive.

Notes for Reviewers

But why are we skipping arm at all?

Lack of pytorch packages. See #61 (comment)

[jameslamb]

Looks like this didn't get in last week. It's not critical, so I've re-targeted it at branch-25.02.

[alexbarghi-nv]

👍