Renaming process.cpu.state attribute to cpu.mode

[mariomac]

The latest OTEL specification renamed process.cpu.state to cpu.mode
https://opentelemetry.io/docs/specs/semconv/system/process-metrics/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.00%. Comparing base (218f156) to head (4681d55).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1110      +/-   ##
==========================================
+ Coverage   81.98%   82.00%   +0.01%     
==========================================
  Files         140      140              
  Lines       11514    11514              
==========================================
+ Hits         9440     9442       +2     
+ Misses       1551     1549       -2     
  Partials      523      523              

Flag	Coverage Δ
integration-test	57.08% <71.42%> (+0.03%)	⬆️
k8s-integration-test	59.15% <100.00%> (+0.03%)	⬆️
oats-test	37.07% <14.28%> (ø)
unittests	52.34% <100.00%> (ø)

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