**Description**

Support passing multiple prefixes to `GoogleCloudStorageListOperator` and `GoogleCloudStorageDeleteOperator` operators.

**Use case / motivation**

I have this folder structure in GCS bucket.

```
+-- year={year}
|   +-- month={month}
|       +--day={day}
|           +-- topic={topic1}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic2}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic3}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic4}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic5}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic6}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic7}
|       +--day={day}
|           +-- topic={topic1}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic2}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic3}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic4}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic5}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic6}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           +-- topic={topic7}
|                 +--file 1
|                 +--file 2
|                 +--file 3
|           ....
```

What I need to achieve is delete one day of objects. For example, I need to delete objects in `year=2020/month=08/day=19`. I can do that easily using `gsutils`. In `gsutil` you can delete them via wild card `gsutil ear=2020/month=08/day=19/*` but using the REST APIs you can't even if you use a prefix. The reason is there is no one prefix to get all the objects inside a folder. I achieved that by using multiple prefixes and for each prefix, I will get the list of objects. Unfortunately, I can't pass more than one prefix to the operators.

**Prefixes used**
- `year=2020/month=08/day=19/topic={topic1}`
- `year=2020/month=08/day=19/topic={topic2}`
- `year=2020/month=08/day=19/topic={topic3}`
- `year=2020/month=08/day=19/topic={topic4}`
- `year=2020/month=08/day=19/topic={topic5}`
- `year=2020/month=08/day=19/topic={topic6}`
- `year=2020/month=08/day=19/topic={topic7}`

:param transform_script: location of the executable transformation script or list of arguments
        passed to subprocess ex. `['python', 'script.py', 10]`. (templated)
    :param chunk_size: The size of a chunk of data when downloading or uploading (in bytes).
        This must be a multiple of 256 KB (per the google clout storage API specification).
    :param download_continue_on_fail: With this set to true, if a download fails the task does not error out
        but will still continue.
    :param upload_chunk_size: The size of a chunk of data when uploading (in bytes).
        This must be a multiple of 256 KB (per the google clout storage API specification).
    :param upload_continue_on_fail: With this set to true, if an upload fails the task does not error out
        but will still continue.
    :param upload_num_attempts: Number of attempts to try to upload a single file.
    """
    template_fields: Sequence[str] = (
        "source_bucket",
        "source_prefix",
        "destination_bucket",
        "destination_prefix",
        "transform_script",
        "source_impersonation_chain",
        "destination_impersonation_chain",
    )
    operator_extra_links = (StorageLink(),)
    @staticmethod
    def interpolate_prefix(prefix: str, dt: datetime.datetime) -> str | None:
        """Interpolate prefix with datetime.
        :param prefix: The prefix to interpolate
        :param dt: The datetime to interpolate
        """
        return dt.strftime(prefix) if prefix else None
    def __init__(