add ui.metrics.pathAllowlist to values.yaml

[agrahamlincoln]

this field can be configured to override ui_config.metrics.path_allowlist in the server ui configuration when ui.metrics.enabled is set to true

Changes proposed in this PR

• add new option to values.yaml
• add this option into server-config-configmap.yaml to modify the template

How I've tested this PR

I pulled this change into my local vendored copy of the helm chart and deployed it with these values.yaml settings modified:

ui:
  enabled: true
  metrics:
    enabled: true
    baseUrl: http://consul-prometheus.consul.svc.cluster.local:9090/consul
    provider: prometheus
    pathAllowlist:
      - /consul/api/v1/query_range
      - /consul/api/v1/query

In the diff (screenshot from argocd ui) i can see the config being applied in the correct location

After deployment I can see that queries in the UI to /v1/internal/ui/metrics-proxy succeed and metrics are displayed in the UI

How I expect reviewers to test this PR

Checklist

• Tests added
• CHANGELOG entry added

[hashicorp-cla-app]

All committers have signed the CLA.