Pick config statsd host from chart helpers

[siryur]

This fixes #35678

Use the helm chart helpers func to set the default statsd hostname on the metrics config. This allows the default values.yaml of the chart to take into consideration the override of the fullnameOverride.

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[amoghrajesh]

Nice. LGTM +1
@jedcunningham @hussein-awala @potiuk WDYT?

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