chore: delete unused code

[sofisl]

Delete unused code

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 8 region tags.

- [samples/generated/v1/web_risk_service.compute_threat_list_diff.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1/web_risk_service.compute_threat_list_diff.js#L24), tag `webrisk_v1_generated_WebRiskService_ComputeThreatListDiff_async` - [samples/generated/v1/web_risk_service.create_submission.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1/web_risk_service.create_submission.js#L24), tag `webrisk_v1_generated_WebRiskService_CreateSubmission_async` - [samples/generated/v1/web_risk_service.search_hashes.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1/web_risk_service.search_hashes.js#L24), tag `webrisk_v1_generated_WebRiskService_SearchHashes_async` - [samples/generated/v1/web_risk_service.search_uris.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1/web_risk_service.search_uris.js#L24), tag `webrisk_v1_generated_WebRiskService_SearchUris_async` - [samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js#L24), tag `webrisk_v1beta1_generated_WebRiskServiceV1Beta1_ComputeThreatListDiff_async` - [samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js#L24), tag `webrisk_v1beta1_generated_WebRiskServiceV1Beta1_SearchHashes_async` - [samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js:24](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js#L24), tag `webrisk_v1beta1_generated_WebRiskServiceV1Beta1_SearchUris_async` - [samples/quickstart.js:18](https://github.com/googleapis/nodejs-web-risk/blob/dba8cb8ab92c25cd65f48b30f4dccf9bde91f82a/samples/quickstart.js#L18), tag `web_risk_quickstart`

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