Turn linux conda builds into no-ops #629

Job	Run time
test-secrets-no-filter-var / test-secrets-no-filter-var	1m 34s
test-secrets-filter-var / test-secrets-filter-var	1m 33s
test-cpu / linux-py3.9-cpu	2m 9s
test-docker-image / linux-job	44s
test-upload-artifact / linux-job	1m 35s
test-upload-artifact-s3 / linux-job	1m 32s
upload-docs / linux-job	1m 35s
test-no-docker / no-docker-test	1m 25s
test-gpu (linux.4xlarge.nvidia.gpu) / linux-py3.9-cu121	6m 29s
test-gpu (linux.g5.4xlarge.nvidia.gpu) / linux-py3.9-cu121	6m 13s
test-gpu-containers (linux.aws.a100) / linux-py3.9-cu121-container	5m 29s
test-with-matrix (3.10) / linux-job	1m 49s
test-with-matrix (3.11) / linux-job	1m 44s
test-with-matrix (3.12) / linux-job	1m 43s
test-with-matrix (3.9) / linux-job	1m 39s
test-download-artifact / linux-job	1m 36s
verify-upload-docs / linux-job	1m 43s
	40m 32s

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