[Dashboard] Enable customizable refresh frequency for the Metrics page

[liuxsh9]

Why are these changes needed?

Currently, each chart on the Metrics page is continuously refreshing, which can put strain on the network and frontend. In our application with @nemo9cby @Bye-legumes, we have noticed that during periods of unstable cluster networks, there can be instances of response timeouts or loss.

Therefore, having the ability to customize the refresh frequency would be helpful.

In the proposed modification, we have set the default refresh frequency to 1 second and provided various frequency configurations, following the example of Grafana. This way, users can choose the refresh interval that best suits their needs.

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