Add support for toggling between loki dashboards by deployment strategy

General MR

Summary

Select between dashboard sets by modifying the values as such:

loki:
  enabled: true
  git:
    tag: null
    branch: "loki-180/dashboard-toggle"
  strategy: scalable
  values:
    istio:
      enabled: true
    monitoring:
      enabled: true
      dashboards:
# alternatively use distributed: true or monolith: true based on chosen deployment strategy
        scalable: true

or use the following as previously to enable all dashboards:

loki:
  enabled: true
  git:
    tag: null
    branch: "loki-180/dashboard-toggle"
  strategy: scalable
  values:
    istio:
      enabled: true
    monitoring:
      enabled: true
      dashboards:
        enabled: true

Relevant logs/screenshots

Linked Issue

issue

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