Adapt hypershift dashboard to management clusters

[morenod]

• Add OBO endpoint
• Modify regexp on hypershift dashboard to correct namespace names
• Fix some graphs on hypershift dashboards, pointing to incorrect namespaces
• On hypershift dashboard, using Prometheus Endpoint for Management Metrics and OBO for Hypershift ones
• Add graphs for CPU and Mem for OBO and hypershift on the management side, and top10 CPU & Mem on Hosted Clusters Control Plane
• Correct indentation of namespace parameter on ocp objects causing Warning: unknown field "namespace"

[morenod]

@rsevilla87 @dry923 this can be tested on http://dittybopper-dittybopper.apps.hs-mc-0vfs0e6gg.iau9.s1.devshift.org/d/3alv4014z/hypershift-performance?orgId=1

[morenod]

Dashboard with last changes: http://dittybopper-dittybopper.apps.hs-mc-0vfs0e6gg.iau9.s1.devshift.org/d/m-gv8914k/hypershift-performance?orgId=1

[morenod]

@dry923 @rsevilla87 please review