Replace type_workarounds.NotImplementedType with types.NotImplementedType #15949

Job	Run time
Misc check	4s
Packaging test	1m 13s
Format check	10s
Isolated pytest Ubuntu	9m 16s
Changed files test	1m 40s
Lint check	4m 19s
Doc test	1m 53s
Type check	1m 23s
Notebook formatting	10s
Check consistency of requirements	27s
Pytest Ubuntu (3.10)	6m 33s
Build protos	13s
Shell check	7s
Pytest Ubuntu (3.11)	5m 49s
Pytest Ubuntu (3.12)	7m 4s
Coverage check	11m 48s
Pytest MacOS (3.10)	10m 17s
Pytest MacOS (3.11)	8m 33s
Notebook Tests against PR	10m 46s
Pytest MacOS (3.12)	17m 25s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	47s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	49s
Bundle file consistency	49s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	44s
Pytest Ubuntu with NumPy-2 (3.10)	6m 48s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	50s
Pytest Ubuntu with NumPy-2 (3.11)	6m 11s
Pytest Ubuntu with NumPy-2 (3.12)	6m 51s
Typescript tests coverage	36s
Typescript lint check	34s
Typescript tests	37s
Pytest Windows (3.10)	12m 3s
Pytest Windows (3.11)	12m 9s
Pytest Windows (3.12)	14m 11s
	2h 43m 9s

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