Disabled dependency chart by default

General MR

Summary

Disable the dependency chart grafana agent and minio. Cleaned up values.yaml. Pod security context can be removed since mimir default securityContext adds in the nonroot user/group and drop all capabilities, see https://github.com/grafana/mimir/blob/main/operations/helm/charts/mimir-distributed/templates/lib/podSecurityContext.tpl will populate the required https://github.com/grafana/mimir/blob/93b9bc174b3222a91a38d60ee9fa5a87a7b09ca1/operations/helm/charts/mimir-distributed/values.yaml#L518

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