🐛 Remove metricsBindAddr from helmchart

[Arakos]

What this PR does / why we need it:

Remove the deprecated and now removed --metrics-bind-addr flag from the helmchart.

Which issue(s) this PR fixes
Fixes #664

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[rouke-broersma]

This should probably be replaced with .Values.diagnosticsAddress, that address is now not exposed at all

Also in that case add a condition around the containerPort because if diagnosticsAddress is set to '" by a chart user, containerPort would be set to 0 which is invalid. This is currently the case with metricsBindAddr