ticket/PSB155: Add is_sham_change column. #2145

Job	Run time
python allensdk_local_py38:latest on-prem test	1h 13m 55s
3.8, macos-latest	18m 43s
3.9, macos-latest	17m 12s
3.10, macos-latest	14m 35s
3.11, macos-latest	28m 38s
3.8, windows-latest	17m 20s
3.9, windows-latest	12m 42s
3.10, windows-latest	12m 0s
3.11, windows-latest	30m 49s
3.8, ubuntu-latest	8m 23s
3.9, ubuntu-latest	7m 37s
3.10, ubuntu-latest	6m 18s
3.11, ubuntu-latest	17m 17s
Lint	33s
	4h 26m 2s

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