[Overvability] Add Grafana dashboard for member cluster state

[jabellard]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @jabellard, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new Grafana dashboard designed to enhance the observability of Karmada member clusters. The dashboard provides a centralized view of critical metrics, including cluster health, resource allocation, utilization, and synchronization performance, enabling users to quickly assess the operational status and resource consumption within their federated Kubernetes environments.

Highlights

• New Grafana Dashboard: A new Grafana dashboard named 'Karmada Member Cluster Insights' has been added to provide comprehensive observability for member cluster states.
• Cluster State Monitoring: The dashboard includes panels to monitor member cluster readiness, total node counts, and the percentage of ready nodes per cluster.
• Resource Capacity and Utilization: Detailed insights into CPU, memory, and pod allocatable versus allocated resources are provided, along with utilization percentages for each resource type across clusters.
• Cluster Sync Status: The dashboard also tracks cluster synchronization status, displaying average and p95 sync durations to help identify potential performance bottlenecks.

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 45.64%. Comparing base (10a5f0f) to head (16d11e1). :warning: Report is 18 commits behind head on master. :exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6851      +/-   ##
==========================================
- Coverage   45.87%   45.64%   -0.24%     
==========================================
  Files         690      692       +2     
  Lines       57392    57703     +311     
==========================================
+ Hits        26331    26336       +5     
- Misses      29425    29720     +295     
- Partials     1636     1647      +11     

Flag	Coverage Δ
unittests	45.64% <ø> (-0.24%)	:arrow_down:

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