ticket/PSB155: Add is_sham_change column. #2121

Job	Run time
Lint	34s
python allensdk_local_py38:latest on-prem test	1h 15m 20s
3.8, macos-latest	15m 2s
3.9, macos-latest	14m 40s
3.10, macos-latest	13m 28s
3.11, macos-latest	32m 17s
3.8, windows-latest	9m 54s
3.9, windows-latest	10m 28s
3.10, windows-latest	12m 49s
3.11, windows-latest	34m 9s
3.8, ubuntu-latest	7m 44s
3.9, ubuntu-latest	6m 9s
3.10, ubuntu-latest	6m 8s
3.11, ubuntu-latest	23m 19s
	4h 22m 1s

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