Use AIBRIX_POD_METRIC_REFRESH_INTERVAL_MS=50 in base configs

[Jeffwan]

Pull Request Description

change AIBRIX_POD_METRIC_REFRESH_INTERVAL_MS in default setting is kind of risky. Some overlay refer the kustomization config without overriding the configs. I consider to override in overlay but notice 10000 is just for testing, then I decide to change back to 50 so people who work on testing can manually update it or create a separate dev overlay. Default should be used by most of the production setups.

Related Issues

Resolves: #[Insert issue number(s)]

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