samples(discoveryengine): Add Import Documents Samples for Google Cloud Sources

[holtskinner]

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

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 7 region tags.

• discoveryengine/import_documents_sample.py:26, tag genappbuilder_import_documents_bigquery
• discoveryengine/import_documents_sample.py:94, tag genappbuilder_import_documents_gcs
• discoveryengine/import_documents_sample.py:165, tag genappbuilder_import_documents_cloud_sql
• discoveryengine/import_documents_sample.py:237, tag genappbuilder_import_documents_spanner
• discoveryengine/import_documents_sample.py:308, tag genappbuilder_import_documents_firestore
• discoveryengine/import_documents_sample.py:377, tag genappbuilder_import_documents_bigtable
• discoveryengine/import_documents_sample.py:467, tag genappbuilder_import_documents_healthcare_fhir

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