refactor: energy data structs

[sthaha]

This commit refactors monitor's Energy Usage struct for clarity and accuracy.

Key changes include:

• Replaced Absolute, Delta, ActiveEnergy, and IdleEnergy with
  EnergyTotal, ActiveEnergyTotal, IdleEnergyTotal, and activeEnergy in NodeUsage.
• Updated Usage struct to use EnergyTotal, removing Delta.
• Enhanced energy attribution in calculateNodePower, calculateProcessPower calculateContainerPower, and calculateVMPower.
• Adjusted Prometheus metrics and stdout exporter to align with new metrics.
• Renamed CPUTimeDelta to ProcessTotalCPUTimeDelta for clarity.
• Updated tests and added new ones for active energy behavior.

Fixes:

• ActiveEnergy Calculation
• Addresses comments in fix(power): correct power attribution by separating used vs idle power #2125

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.74%. Comparing base (c3b4722) to head (356c2d7).
Report is 8 commits behind head on reboot.

Additional details and impacted files

@@            Coverage Diff             @@
##           reboot    #2134      +/-   ##
==========================================
+ Coverage   86.22%   91.74%   +5.51%     
==========================================
  Files          34       34              
  Lines        2991     2991              
==========================================
+ Hits         2579     2744     +165     
+ Misses        369      193     -176     
- Partials       43       54      +11     

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