feat(advisor): apply cpu headroom discount when power level is present

[h-w-chen]

What type of PR is this?

Features

What this PR does / why we need it:

This PR allows power-ware plugin to enable reclaimed cpu headroom discount when the node's power level is of p1/p2/p3.

To ensure the power-aware plugin enabling to happen prior qos-aware cpu resource advisor being called to GetHeadroom, Init phase is put with cpu sub resource advisor up to qos-aware plugin.

[codecov]

Codecov Report

❌ Patch coverage is 52.50000% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.38%. Comparing base (798dc28) to head (3f50bee).
⚠️ Report is 81 commits behind head on main.

Files with missing lines	Patch %	Lines
.../headroomassembler/decorator/decorator_discount.go	54.83%	23 Missing and 5 partials ⚠️
...assembler/headroomassembler/decorator/decorator.go	35.29%	11 Missing ⚠️
...sor/plugin/qosaware/resource/cpu/advisor_helper.go	30.00%	6 Missing and 1 partial ⚠️
...ptions/sysadvisor/poweraware/power_aware_plugin.go	69.23%	4 Missing ⚠️
...sadvisor/plugin/qosaware/resource/resource_stub.go	0.00%	4 Missing ⚠️
.../agent/sysadvisor/plugin/poweraware/power_aware.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1034      +/-   ##
==========================================
+ Coverage   59.86%   60.38%   +0.51%     
==========================================
  Files         689      702      +13     
  Lines       65082    66792    +1710     
==========================================
+ Hits        38964    40335    +1371     
- Misses      21657    21886     +229     
- Partials     4461     4571     +110     

Flag	Coverage Δ
unittest	60.38% <52.50%> (+0.51%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.