Delete unused dataclass cirq_google.CalibrationResult (#7677)

Commit e76702f (#6442) deprecated the
`cirq_google.CalibrationResult`
class and removed its serialization test data. The class does not appear
to have any callers in the Cirq codebase.

Author: pavoljuhas

cirq-google/cirq_google/__init__.py

@@ -29,7 +29,6 @@
 from cirq_google.engine import (
     Calibration as Calibration,
     CalibrationLayer as CalibrationLayer,
-    CalibrationResult as CalibrationResult,
     Engine as Engine,
     EngineJob as EngineJob,
     EngineProgram as EngineProgram,

cirq-google/cirq_google/engine/__init__.py

@@ -48,8 +48,6 @@
 
 from cirq_google.engine.calibration_layer import CalibrationLayer as CalibrationLayer
 
-from cirq_google.engine.calibration_result import CalibrationResult as CalibrationResult
-
 from cirq_google.engine.calibration_to_noise_properties import (
     noise_properties_from_calibration as noise_properties_from_calibration,
 )

cirq-google/cirq_google/engine/calibration_result.py

@@ -31,7 +31,6 @@
     from google.protobuf import any_pb2
 
     import cirq_google.engine.engine as engine_base
-    from cirq_google.engine.calibration_result import CalibrationResult
     from cirq_google.engine.engine import engine_processor, engine_program
 
 TERMINAL_STATES = [
@@ -91,7 +90,6 @@ def __init__(
         self.context = context
         self._job = _job
         self._results: Sequence[EngineResult] | None = None
-        self._calibration_results: Sequence[CalibrationResult] | None = None
         self._batched_results: Sequence[Sequence[EngineResult]] | None = None
         self._job_result_future = job_result_future
 

cirq-google/cirq_google/engine/engine_job.py

@@ -29,7 +29,6 @@
         'ProcessorSampler',
         'ValidatingSampler',
         'CouldNotPlaceError',
-        'CalibrationResult',
         # Abstract:
         'ExecutableSpec',
     ],