Fixes incorrect resource model selection

[RainbowMango]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Found this issue during the review of documents at karmada-io/website#713 (comment) by @LavredisG.

Given the resource model:

  resourceModels:
  - grade: 0
    ranges:
    - max: "1"
      min: "0"
      name: cpu
  - grade: 1
    ranges:
    - max: "2"
      min: "1"
      name: cpu
  - grade: 2
    ranges:
    - max: "4"
      min: "2"
      name: cpu

If a Pod request 1 CPU, grade 1 will be selected.
If a Pod request 1.5 CPU, grade 1 will be ignored as we are not sure it can provide sufficient resources.

Does this PR introduce a user-facing change?:

`karmada-scheduler`: Fixes an issue where resource model grades were incorrectly matched based on resource requests. Now only grades that can provide sufficient resources will be selected.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.85%. Comparing base (29c97e9) to head (a6679dd).
Report is 42 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5706      +/-   ##
==========================================
+ Coverage   39.15%   39.85%   +0.70%     
==========================================
  Files         650      650              
  Lines       45207    55145    +9938     
==========================================
+ Hits        17701    21980    +4279     
- Misses      26142    31753    +5611     
- Partials     1364     1412      +48     

Flag	Coverage Δ
unittests	39.85% <100.00%> (+0.70%)	⬆️

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[RainbowMango]

cc @chaosi-zju
and @wangxf1987 to take a look.

[wangxf1987]

lgtm

[chaosi-zju]

You're absolutely right

/lgtm

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