[destination-bigquery] Soft delete setting null fields

### Connector Name

destination-bigquery

### Connector Version

3.0.15

### What step the error happened?

During the sync

### Relevant information

Hello everyone!

I'm having a problem with soft deletes in Airbyte - BigQuery.

From what I've read in the documentation, the soft delete should mark the _ab_cdc_deleted_at field with the deletion data.

In practice, in addition to performing this update, Airbyte is updating all fields, setting all of them as null, except for _id.

More information:

Source: MongoDB
Destination: BigQuery
Airbyte version: 2.0.1
Connector version: BigQuery v3.0.15

Example:

### Relevant log output

```shell

```

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