Replace type_workarounds.NotImplementedType with types.NotImplementedType #15947

Job	Run time
Coverage check	2m 59s
Build protos	16s
Changed files test	1m 9s
Doc test	1m 19s
Format check	14s
Lint check	3m 54s
Isolated pytest Ubuntu	2m 43s
Type check	1m 22s
Notebook formatting	16s
Pytest MacOS (3.10)	1m 47s
Pytest MacOS (3.11)	2m 2s
Notebook Tests against PR	18m 31s
Pytest MacOS (3.12)	2m 4s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	52s
Packaging test	56s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	56s
Check consistency of requirements	24s
Pytest Ubuntu (3.10)	2m 56s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	47s
Pytest Ubuntu with NumPy-2 (3.10)	2m 7s
Pytest Ubuntu (3.11)	2m 57s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	50s
Misc check	4s
Pytest Ubuntu with NumPy-2 (3.11)	2m 23s
Pytest Ubuntu (3.12)	3m 3s
Pytest Ubuntu with NumPy-2 (3.12)	2m 23s
Shell check	6s
Bundle file consistency	48s
Typescript tests coverage	36s
Typescript lint check	34s
Pytest Windows (3.10)	20m 14s
Pytest Windows (3.11)	20m 24s
Typescript tests	39s
Pytest Windows (3.12)	20m 14s
	2h 2m 49s

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