Deleting a collection in vector search version 2 with objects is not possible

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### Summary of the issue

When running the quickstart example of vector search version 2 colab https://colab.research.google.com/github/GoogleCloudPlatform/generative-ai/blob/main/embeddings/vector-search-quickstart.ipynb
a collection is created.

The notebooks falsely prints at the end that this collection is deleted, like this
`# Delete the Collection (and all Data Objects inside it)
request = vectorsearch_v1beta.DeleteCollectionRequest(
name=f"projects/{PROJECT_ID}/locations/{LOCATION}/collections/{collection_id}"
)
vector_search_service_client.delete_collection(request)
print(f"🗑️ Deleted Collection: {collection_id}")
print(" All Data Objects in the Collection have been deleted as well.")
print("\n✅ Cleanup complete! All Vector Search 2.0 resources have been deleted.")`

It never looks the actual result up, like in the doc
https://docs.cloud.google.com/vertex-ai/docs/vector-search-2/collections/collections#deleting_a_collection
`operation.result()`

When running for the result, one can see that the collection is not deleted, the request fails with
`FailedPrecondition: 400 Invalid resource state for "projects/xxx": Collection deletion is not allowed because it still has data objects. 9: Invalid resource state for "projects/xxx": Collection deletion is not allowed because it still has data objects.`
, which is not documented behaviour, the notebook even says this cmd should delete all objects in the collection.

Current doc for deleting objects [doc](https://docs.cloud.google.com/vertex-ai/docs/vector-search-2/data-objects/data-objects#delete_data_objects) is not documenting how do batch delete all points.

The api auto doc does not name any forcing parameters for delete collection request [doc](https://docs.cloud.google.com/python/docs/reference/google-cloud-vectorsearch/latest/google.cloud.vectorsearch_v1beta.services.vector_search_service.VectorSearchServiceClient#google_cloud_vectorsearch_v1beta_services_vector_search_service_VectorSearchServiceClient_delete_collection) .

The api auto doc for batch delete objects [doc](https://docs.cloud.google.com/python/docs/reference/google-cloud-vectorsearch/latest/google.cloud.vectorsearch_v1beta.services.data_object_service.DataObjectServiceClient#google_cloud_vectorsearch_v1beta_services_data_object_service_DataObjectServiceClient_batch_delete_data_objects) does not describe the [request object ](https://docs.cloud.google.com/python/docs/reference/google-cloud-vectorsearch/latest/google.cloud.vectorsearch_v1beta.types.DeleteDataObjectRequest.html), but it looks impossible to delete all at once: “A maximum of 1000 DataObjects can be deleted in a batch.”. This suggests that one has to collect all ids first and delete in many batches….

The link to github issues in the notebook goes to nowhere https://github.com/googleapis/python-vector-search/issues

How to delete a collection with objects?

### API client name and version

google-cloud-vectorsearch >= 0.7.0 , <= 0.9.0

### Reproduction steps: code

run the quickstart example of vector search version 2 colab https://colab.research.google.com/github/GoogleCloudPlatform/generative-ai/blob/main/embeddings/vector-search-quickstart.ipynb
to the end.

Modify the step where the collection is deleted to actually look the result of the operation up, like https://docs.cloud.google.com/vertex-ai/docs/vector-search-2/collections/collections#deleting_a_collection

### Reproduction steps: supporting files

_No response_

### Reproduction steps: actual results

FailedPrecondition: 400 Invalid resource state for "projects/xxx": Collection deletion is not allowed because it still has data objects. 9: Invalid resource state for "projects/xxx": Collection deletion is not allowed because it still has data objects.

### Reproduction steps: expected results

200 success

### OS & version + platform

_No response_

### Python environment

_No response_

### Python dependencies

_No response_

### Additional context

_No response_