feat(bigquery): update the api

#### bigquery:v2

The following keys were deleted:
- schemas.Model.properties.trainingRuns.readOnly (Total Keys: 1)

The following keys were added:
- schemas.JobConfigurationLoad.properties.createSession.type (Total Keys: 1)
- schemas.TrainingRun.properties.classLevelGlobalExplanations.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.dataSplitResult.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.evaluationMetrics.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.modelLevelGlobalExplanation.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.results.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.startTime.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.trainingOptions.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.trainingStartTime.readOnly (Total Keys: 1)
- schemas.TrainingRun.properties.vertexAiModelVersion.readOnly (Total Keys: 1)

Author: yoshi-automation