Update the URL for the Metric Service

[yifanyang]

The custom domain "firebase-sdk-health-metrics.com" currently associated with the Metric Service will be deprecated eventually, due to the acquisition of Google Domains by Squarespace.

Switching to the original URL created by Google Cloud Run (which hosts the Metric Service) to avoid service disruption.

See b/303931111 for more details.

[changeset-bot[bot]]

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Latest commit: 1d26ef349c806238f10f68b6bd00a831ce6b73a7

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[yifanyang]

@hsubox76 Hey Christina, it looks like I no longer have the permission to merge the pull request. Can you help me do that?