Silence pytest warnings about asyncio fixture scope #15708

Job	Run time
Misc check	7s
Packaging test	1m 11s
Doc test	1m 47s
Coverage check	9m 26s
Changed files test	1m 23s
Build protos	10s
Format check	7s
Isolated pytest Ubuntu	7m 45s
Lint check	2m 41s
Type check	1m 23s
Notebook formatting	11s
Check consistency of requirements	27s
Pytest Ubuntu (3.10)	5m 25s
Shell check	6s
Pytest Ubuntu (3.11)	4m 58s
Pytest MacOS (3.10)	7m 14s
Pytest Ubuntu (3.12)	5m 33s
Pytest MacOS (3.11)	5m 51s
Pytest MacOS (3.12)	12m 22s
Notebook Tests against PR	10m 36s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	48s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	1m 7s
Bundle file consistency	41s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	47s
Typescript tests coverage	32s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	56s
Typescript lint check	33s
Typescript tests	46s
Pytest Windows (3.10)	7m 46s
Pytest Windows (3.11)	7m 7s
Pytest Windows (3.12)	7m 1s
	1h 46m 47s

Provide feedback