make cugraph-ops optional for cugraph-pyg #163

Job	Run time
changed-files / Check changed files	7s
devcontainer / amd64, 12.5, conda	5m 24s
checks / check-style	1m 40s
checks / other-checks	35s
devcontainer / amd64, 12.5, pip	7m 45s
wheel-build-cugraph-pyg	0s
wheel-build-pylibwholegraph	0s
conda-cpp-build	0s
wheel-build-cugraph-dgl	0s
conda-cpp-tests	0s
wheel-tests-cugraph-dgl	0s
conda-python-build	0s
wheel-tests-cugraph-pyg	0s
wheel-tests-pylibwholegraph	0s
conda-python-tests	0s
conda-notebook-tests	0s
pr-builder / run	1s
	15m 32s

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