refactor sysadvisor cpu headroom assembler by abstract the logic of util-based capacity estimation

[luomingmeng]

What type of PR is this?

Enhancements

What this PR does / why we need it:

refactor sysadvisor cpu headroom assembler by abstract the logic of util-based capacity estimation

[codecov]

Codecov Report

Patch coverage: 86.84% and project coverage change: +0.50 🎉

Comparison is base (c4389f8) 50.26% compared to head (cda2d86) 50.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   50.26%   50.77%   +0.50%     
==========================================
  Files         408      408              
  Lines       38772    38779       +7     
==========================================
+ Hits        19490    19691     +201     
+ Misses      17093    16870     -223     
- Partials     2189     2218      +29     

Flag	Coverage Δ
unittest	50.77% <86.84%> (+0.50%)	⬆️

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

Impacted Files	Coverage Δ
...sembler/headroomassembler/assembler_common_util.go	58.82% <68.75%> (-20.77%)	⬇️
...n/qosaware/resource/helper/estimation_canonical.go	76.63% <100.00%> (+6.04%)	⬆️

... and 16 files with indirect coverage changes

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