Standardize access to metrics and healthcheck

[AndreaFrancis]

In some apps, the metrics and healthcheck are public:

• https://datasets-server.huggingface.co/admin/metrics

• https://datasets-server.huggingface.co/sse/metrics

• https://datasets-server.huggingface.co/sse/healthcheck

• https://datasets-server.huggingface.co/healthcheck

• On others, it’s forbidden or not found:

• https://datasets-server.huggingface.co/metrics

• https://datasets-server.huggingface.co/filter/metrics

As @severo suggests, it should be coherent among all the services. (Do we want the metrics to be public, or not?)

[github-actions]

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