Add Beyla debug dashboard

[marctc]

This PR adds a Grafana dashboard to debug runing instace of Beyla. To get more visibilty, we recomend:

• Enable internal metrics to visualize instrumented services.
• Append application_process to BEYLA_PROMETHEUS_FEATURES (explained here) and instrument Beyla itself to visualize CPU and Mem consumption of Beyla.
• Set BEYLA_LOG_LEVEL=debug to view debug logs.
• Set BEYLA_BPF_DEBUG=1 to view BPF logs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.81%. Comparing base (3fd9525) to head (1e23719).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1098      +/-   ##
==========================================
+ Coverage   73.63%   73.81%   +0.17%     
==========================================
  Files         172      172              
  Lines       13091    13091              
==========================================
+ Hits         9640     9663      +23     
+ Misses       2901     2879      -22     
+ Partials      550      549       -1     

Flag	Coverage Δ
integration-test	51.00% <ø> (-0.23%)	⬇️
k8s-integration-test	52.88% <ø> (+0.01%)	⬆️
oats-test	34.06% <ø> (+0.31%)	⬆️
unittests	45.64% <ø> (+<0.01%)	⬆️

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[grcevski]

LGTM! Good stuff!