docs(samples): add generated samples

[sofisl]

[generated-files-bot[bot]]

Warning: This pull request is touching the following templated files:

• samples/README.md - samples/README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 13 region tags.

• samples/generated/v1/datastore.allocate_ids.js:24, tag datastore_v1_generated_Datastore_AllocateIds_async
• samples/generated/v1/datastore.begin_transaction.js:24, tag datastore_v1_generated_Datastore_BeginTransaction_async
• samples/generated/v1/datastore.commit.js:24, tag datastore_v1_generated_Datastore_Commit_async
• samples/generated/v1/datastore.lookup.js:24, tag datastore_v1_generated_Datastore_Lookup_async
• samples/generated/v1/datastore.reserve_ids.js:24, tag datastore_v1_generated_Datastore_ReserveIds_async
• samples/generated/v1/datastore.rollback.js:24, tag datastore_v1_generated_Datastore_Rollback_async
• samples/generated/v1/datastore.run_query.js:24, tag datastore_v1_generated_Datastore_RunQuery_async
• samples/generated/v1/datastore_admin.create_index.js:24, tag datastore_v1_generated_DatastoreAdmin_CreateIndex_async
• samples/generated/v1/datastore_admin.delete_index.js:24, tag datastore_v1_generated_DatastoreAdmin_DeleteIndex_async
• samples/generated/v1/datastore_admin.export_entities.js:24, tag datastore_v1_generated_DatastoreAdmin_ExportEntities_async
• samples/generated/v1/datastore_admin.get_index.js:24, tag datastore_v1_generated_DatastoreAdmin_GetIndex_async
• samples/generated/v1/datastore_admin.import_entities.js:24, tag datastore_v1_generated_DatastoreAdmin_ImportEntities_async
• samples/generated/v1/datastore_admin.list_indexes.js:24, tag datastore_v1_generated_DatastoreAdmin_ListIndexes_async

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[sofisl]

Fixes #899