Remove rST-specific code in snippets_test.py #17198

Job	Run time
Format check	12s
Doc test	1m 37s
Lint check	2m 42s
Type check	1m 29s
Packaging test	1m 13s
Misc check	5s
Shell check	6s
Build protos	15s
Changed files test	1m 10s
Coverage check	12m 28s
Isolated pytest Ubuntu	8m 25s
Check consistency of requirements	18s
Notebook formatting	8s
Pytest Ubuntu (3.10)	6m 14s
Pytest Windows (3.10)	9m 57s
Pytest Ubuntu (3.11)	5m 42s
Pytest Windows (3.11)	9m 9s
Pytest Ubuntu (3.12)	6m 54s
Pytest Windows (3.12)	9m 25s
Pytest Ubuntu with NumPy-2 (3.10)	6m 47s
Pytest MacOS (3.10)	7m 55s
Pytest MacOS (3.11)	6m 40s
Notebook Tests against PR	11m 12s
Pytest Ubuntu with NumPy-2 (3.11)	6m 53s
Pytest MacOS (3.12)	8m 19s
Pytest Ubuntu with NumPy-2 (3.12)	6m 43s
Pytest Ubuntu with NumPy-2 (3.13)	6m 54s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	48s
Bundle file consistency	45s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	53s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	52s
Typescript tests coverage	32s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	52s
Typescript lint check	37s
Typescript tests	37s
	2h 24m 48s

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