feat: add metric for number of chunks excluded from the block due to insufficient endorsement

[pugachAG]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.13%. Comparing base (6af8e01) to head (606940d).
Report is 12 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12562   +/-   ##
=======================================
  Coverage   70.13%   70.13%           
=======================================
  Files         841      841           
  Lines      169899   169912   +13     
  Branches   169899   169912   +13     
=======================================
+ Hits       119156   119167   +11     
- Misses      45605    45607    +2     
  Partials     5138     5138           

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (-0.01%)	⬇️
db-migration	0.16% <0.00%> (-0.01%)	⬇️
genesis-check	1.29% <0.00%> (-0.01%)	⬇️
linux	69.36% <100.00%> (-0.01%)	⬇️
linux-nightly	69.71% <100.00%> (-0.01%)	⬇️
pytests	1.59% <0.00%> (-0.01%)	⬇️
sanity-checks	1.40% <0.00%> (-0.01%)	⬇️
unittests	69.95% <100.00%> (+<0.01%)	⬆️
upgradability	0.20% <0.00%> (-0.01%)	⬇️

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[wacban]

LGTM

For this metric to work sensibly we need to collect the metrics from the block producers in production. Do you happen to know where do we stand on that?