slo-controller: refactor codes for reading

[hormes]

Ⅰ. Describe what this PR does

Here we just adjusted the naming of the code and added a diagram to explain the calculation logic of Batch resources. The code logic has not been changed.

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 67.54%. Comparing base (cd58ac6) to head (09aa753).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...troller/noderesource/plugins/batchresource/util.go	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1973      +/-   ##
==========================================
- Coverage   67.56%   67.54%   -0.02%     
==========================================
  Files         420      420              
  Lines       47059    47060       +1     
==========================================
- Hits        31795    31787       -8     
- Misses      12955    12960       +5     
- Partials     2309     2313       +4     

Flag	Coverage Δ
unittests	67.54% <92.59%> (-0.02%)	⬇️

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[zwzhang0107]

we also have a node.koordinator.sh/system-qos-resource inside koordinator reserve, which is used for pod with system qos.

[hormes]

we also have a node.koordinator.sh/system-qos-resource inside koordinator reserve, which is used for pod with system qos.

It is in koordinator, the reason I won't elaborate here is to make it easier to understand. There will be a user document later to explain in detail some of the details and how to use it.

[zwzhang0107]

/lgtm

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