app/health: fix peer and error checks

[corverroos]

Fixes the following checks:

• high_error_log_rate align with warning check since we not only log errors when user intervention is required.
• insufficient_connected_peers fix metric name

category: bug
ticket: none

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.22 ⚠️

Comparison is base (db4822a) 53.85% compared to head (1832892) 53.64%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2411      +/-   ##
==========================================
- Coverage   53.85%   53.64%   -0.22%     
==========================================
  Files         196      196              
  Lines       26271    26273       +2     
==========================================
- Hits        14149    14093      -56     
- Misses      10377    10434      +57     
- Partials     1745     1746       +1     

Impacted Files	Coverage Δ
app/health/checks.go	60.86% <100.00%> (+1.77%)	⬆️

... and 12 files with indirect coverage changes

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