Improve panels in the playground grafana

[harjotgill]

This change is 

[codecov]

Codecov Report

Base: 49.52% // Head: 49.52% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (d16065b) compared to base (5408d30).
Patch coverage: 73.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
- Coverage   49.52%   49.52%   -0.01%     
==========================================
  Files         226      226              
  Lines       18543    18542       -1     
==========================================
- Hits         9184     9183       -1     
  Misses       8767     8767              
  Partials      592      592              

Impacted Files	Coverage Δ
...aplane/actuators/concurrency/load-shed-actuator.go	0.00% <0.00%> (ø)
pkg/flowcontrol/common/metrics.go	74.07% <100.00%> (ø)
pkg/otelcollector/metricsprocessor/processor.go	70.89% <100.00%> (-0.14%)	⬇️
operator/controllers/controller_reconciler.go	46.35% <0.00%> (-1.17%)	⬇️
operator/controllers/agent_reconciler.go	49.27% <0.00%> (+0.97%)	⬆️

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