feat: add set client endpoint sample

[alvarowolfx]

Towards internal b/254876447

[snippet-bot]

Here is the summary of changes.

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• samples/setClientEndpoint.js:18, tag bigquery_set_client_endpoint

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[loferris]

Looks great, just needs a bit of tweaking for the developer values to be in line with other samples!

[loferris]

Looks good, just resolve the failing checks, the one showing up right now: "samples/setClientEndpoint.js should have a copyright year of 2023"

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