bug: `query_and_wait` drops unknown properties in the QueryJobConfig

In implementing pandas-gbq integration with the new, faster `query_and_wait` method, a test failure raised the issue that some request body details in a custom job configuration are being dropped. See: https://github.com/googleapis/python-bigquery-pandas/pull/722/files/7739f41989c5d0effbaf66070c6b94b6c3840506#r1459296431

#### Steps to reproduce

1. Create a `QueryJobConfig` with unknown or invalid parameters via `from_api_repr()`
2. Pass the `job_config` to `query_and_wait()`.
3. Observe that the extra parameters are not sent.

#### Code example

```python
import google.cloud.bigquery
client = google.cloud.bigquery.Client()
project_id = "swast-scratch"

job_config = google.cloud.bigquery.QueryJobConfig.from_api_repr(
        {
            "copy": {
                "sourceTable": {
                    "projectId": project_id,
                    "datasetId": "publicdata:samples",
                    "tableId": "wikipedia",
                },
                "destinationTable": {
                    "projectId": project_id,
                    "datasetId": "publicdata:samples",
                    "tableId": "wikipedia_copied",
                },
            }
        })
client.query_and_wait("select 1", job_config=job_config)
```

#### Stack trace

No stack trace is produced, even though one should be due to an invalid configuration.


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bug: `query_and_wait` drops unknown properties in the QueryJobConfig #1792

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bug: query_and_wait drops unknown properties in the QueryJobConfig #1792

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bug: `query_and_wait` drops unknown properties in the QueryJobConfig #1792