Add Pax singleprocess train and eval tests #1001

Job	Run time
metadata	3s
build-base / build (amd64)	4m 58s
build-base / build (arm64)	5m 9s
test-distribution / test-create-distribution (extra-only-distribution.sh)	9s
test-distribution / test-create-distribution (mirror-only-distribution.sh)	4s
test-distribution / test-create-distribution (upstream-only-distribution.sh)	7s
build-base / merge	8s
build-jax / build (amd64)	6m 18s
build-jax / build (arm64)	6m 34s
build-jax / merge	0s
build-te	0s
build-pax	0s
build-t5x	0s
test-jax	0s
test-te	0s
build-rosetta-pax	0s
test-pax	0s
test-t5x	0s
build-rosetta-t5x	0s
build-summary	1s
retrofit-containers	1m 41s
test-vit	0s
finalize / report / action	6s
finalize / upload-badge / action	3s
finalize / publish-badge	0s
	25m 21s

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