refac: Adjust lido-exporter Grafana dashboard

[khalifaa55]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 44.70%. Comparing base (7948325) to head (0a675f8).

Files with missing lines	Patch %	Lines
cmd/lido-exporter/metrics/metrics.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #424      +/-   ##
===========================================
- Coverage    44.71%   44.70%   -0.01%     
===========================================
  Files          115      115              
  Lines         9992     9994       +2     
===========================================
  Hits          4468     4468              
- Misses        5031     5033       +2     
  Partials       493      493              

Flag	Coverage Δ
unittests	44.70% <0.00%> (-0.01%)	⬇️

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