Replace type_workarounds.NotImplementedType with types.NotImplementedType #15953

Job	Run time
Format check	13s
Type check	1m 24s
Changed files test	1m 43s
Doc test	1m 54s
Isolated pytest Ubuntu	8m 13s
Lint check	4m 14s
Notebook formatting	10s
Packaging test	1m 20s
Misc check	6s
Shell check	6s
Build protos	19s
Coverage check	10m 53s
Notebook Tests against PR	10m 13s
Pytest MacOS (3.10)	7m 26s
Pytest MacOS (3.11)	7m 9s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	48s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	53s
Check consistency of requirements	29s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	49s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	47s
Pytest Ubuntu (3.10)	6m 49s
Pytest MacOS (3.12)	7m 29s
Pytest Ubuntu (3.11)	6m 31s
Pytest Ubuntu with NumPy-2 (3.10)	6m 53s
Pytest Ubuntu with NumPy-2 (3.11)	6m 39s
Pytest Ubuntu (3.12)	6m 48s
Bundle file consistency	45s
Pytest Ubuntu with NumPy-2 (3.12)	6m 54s
Typescript lint check	33s
Typescript tests	38s
Pytest Windows (3.10)	12m 3s
Pytest Windows (3.11)	12m 15s
Typescript tests coverage	35s
Pytest Windows (3.12)	12m 15s
	2h 26m 16s

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