### Apache Airflow version

main (development)

### What happened

1. When not providing `project_id` to `BigQueryGetDataOperator` in deferrable mode (`project_id=None`), the query generated by `generate_query` method is bugged, i.e.,: 

````sql
from `None.DATASET.TABLE_ID` limit ...
````

2. `as_dict` param does not work `BigQueryGetDataOperator`.

### What you think should happen instead

1. When `project_id` is `None` - it should be removed from the query along with the trailing dot, i.e.,:

````sql
from `DATASET.TABLE_ID` limit ...
````

2. `as_dict` should be added to the serialization method of `BigQueryGetDataTrigger`.

### How to reproduce

1. Create a DAG file with `BigQueryGetDataOperator` defined as follows:
```python
BigQueryGetDataOperator(
        task_id="bq_get_data_op",
        # project_id="PROJECT_ID",  <-- Not provided
        dataset_id="DATASET",
        table_id="TABLE",
        use_legacy_sql=False,
        deferrable=True
    )
````

2. 1. Create a DAG file with `BigQueryGetDataOperator` defined as follows:
```python
BigQueryGetDataOperator(
        task_id="bq_get_data_op",
        project_id="PROJECT_ID",
        dataset_id="DATASET",
        table_id="TABLE",
        use_legacy_sql=False,
        deferrable=True,
        as_dict=True
    )
````

### Operating System

Debian

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### Anything else

The `generate_query` method is not unit tested (which would have prevented it in the first place) - will be better to add one.

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Helper class for constructing BigQuery link."""
    index: int = attr.ib()
    @property
    def name(self) -> str:
        return f"BigQuery Console #{self.index + 1}"
    def get_link(
        self,
        operator: BaseOperator,
        *,
        ti_key: TaskInstanceKey,
    ):
        job_ids = XCom.get_value(key="job_id", ti_key=ti_key)
        if not job_ids:
            return None
        if len(job_ids) < self.index:
            return None
        job_id = job_ids[self.index]
        return BIGQUERY_JOB_DETAILS_LINK_FMT.format(job_id=job_id)
class _BigQueryDbHookMixin:
    def get_db_hook(self: BigQueryCheckOperator) -> BigQueryHook:  
        """Get BigQuery DB Hook"""
        return BigQueryHook(
            gcp_conn_id=self.gcp_conn_id,
            use_legacy_sql=self.use_legacy_sql,
            location=self.location,
            impersonation_chain=self.impersonation_chain,
            labels=self.labels,
        )
class BigQueryCheckOperator(_BigQueryDbHookMixin, SQLCheckOperator):