Refactor tests into new categories reviewed by Eric Gamma #385

Job	Run time
get-test-groups	3s
"python=3.8", group_cpu_001	34m 22s
"python=3.8", group_notebooks_cpu_001	31m 26s
"python=3.8", group_spark_001	32m 20s
"python=3.8", group_notebooks_spark_001	34m 22s
"python=3.8", group_notebooks_spark_002	28m 21s
"python=3.8", group_gpu_001	34m 5s
"python=3.8", group_gpu_002	34m 24s
"python=3.8", group_notebooks_gpu_001	34m 22s
"python=3.8", group_notebooks_gpu_002	34m 21s
"python=3.9", group_cpu_001	34m 23s
"python=3.9", group_notebooks_cpu_001	31m 59s
"python=3.9", group_spark_001	30m 47s
"python=3.9", group_notebooks_spark_001	34m 5s
"python=3.9", group_notebooks_spark_002	28m 20s
"python=3.9", group_gpu_001	34m 23s
"python=3.9", group_gpu_002	34m 20s
"python=3.9", group_notebooks_gpu_001	34m 27s
"python=3.9", group_notebooks_gpu_002	34m 21s
	9h 55m 11s

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