Refactor tests into new categories reviewed by Eric Gamma #386

Job	Run time
get-test-groups	6s
"python=3.8", group_cpu_001	37m 32s
"python=3.8", group_notebooks_cpu_001	33m 27s
"python=3.8", group_spark_001	34m 53s
"python=3.8", group_notebooks_spark_001	35m 23s
"python=3.8", group_notebooks_spark_002	27m 59s
"python=3.8", group_gpu_001	32m 27s
"python=3.8", group_gpu_002	37m 48s
"python=3.8", group_notebooks_gpu_001	37m 53s
"python=3.8", group_notebooks_gpu_002	37m 47s
"python=3.9", group_cpu_001	37m 48s
"python=3.9", group_notebooks_cpu_001	33m 21s
"python=3.9", group_spark_001	33m 59s
"python=3.9", group_notebooks_spark_001	36m 24s
"python=3.9", group_notebooks_spark_002	30m 13s
"python=3.9", group_gpu_001	32m 6s
"python=3.9", group_gpu_002	34m 37s
"python=3.9", group_notebooks_gpu_001	37m 46s
"python=3.9", group_notebooks_gpu_002	37m 45s
	10h 29m 14s

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