samples(discoveryengine): Add Create/Delete Data Store Samples

[holtskinner]

Description

Create and Delete Data Store Samples for Vertex AI Search

https://cloud.google.com/generative-ai-app-builder/docs/create-data-store-es#website

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• discoveryengine/create_data_store_sample.py:16, tag genappbuilder_create_data_store
• discoveryengine/delete_data_store_sample.py:16, tag genappbuilder_delete_data_store

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