Fix metrics labeling issue

[yzang2019]

Describe your changes and provide context

This PR fix an existing issue caused by previous commits after we added new metrics. Since we don't use labeling, we shouldn't add label to the metric definition.

Testing performed to validate your change

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 58.11%. Comparing base (5e8e9a2) to head (1635f94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   57.81%   58.11%   +0.29%     
==========================================
  Files         249      249              
  Lines       34006    34006              
==========================================
+ Hits        19660    19761     +101     
+ Misses      12771    12681      -90     
+ Partials     1575     1564      -11     

Files	Coverage Δ
internal/consensus/metrics.go	84.90% <ø> (ø)
internal/consensus/metrics.gen.go	13.96% <0.00%> (ø)
internal/state/metrics.gen.go	14.14% <0.00%> (ø)

... and 18 files with indirect coverage changes