Delete unused dataclass cirq_google.CalibrationResult #19776

Job	Run time
Format check	13s
Packaging test	1m 21s
Type check	1m 40s
Lint check	2m 26s
Changed files test	4m 35s
Misc check	6s
Check consistency of requirements	21s
Bundle file consistency	47s
Typescript tests	44s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	54s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	51s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	50s
Doc test	1m 41s
Isolated pytest Ubuntu	8m 8s
Shell check	10s
Pytest Windows (3.12)	9m 1s
Pytest MacOS (3.13)	10m 16s
Pytest Windows (3.11)	8m 43s
Pytest MacOS (3.11)	10m 52s
Pytest MacOS (3.12)	7m 49s
Build protos	18s
Pytest Windows (3.13)	9m 10s
Coverage check	19m 36s
Pytest Ubuntu (3.12)	10m 14s
Typescript tests coverage	38s
Notebook formatting	11s
Pytest Ubuntu (3.13)	10m 53s
Typescript lint check	36s
Notebook Tests against PR	9m 53s
Pytest Ubuntu (3.11)	10m 11s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	55s
	2h 24m 3s

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