Allow templating inside .Values.namespace

[jkroepke]

What this PR does / why we need it:

Allow variables inside .Values.namespace, like {{ .Release.Namespace }}.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
N/A

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jkroepke
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[brancz]

/assign @tariq1890

[mrueg]

/hold
We are currently migrating the chart to a new location.
See #1448 for more information

[mrueg]

Thanks for your contribution. We moved our helm charts to https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-state-metrics Feel free to reopen a PR on https://github.com/prometheus-community/helm-charts/ !