fix federated-hpa plain metric calc

[zach593]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fix plain metric calculation error when usageRatio == 1.0 which I fixed in kubernetes/kubernetes#117845

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`kamrada-controller-manager`: Fix federated-HPA plain metric calculation is incorrect when usageRatio == 1.0, keep same with resource replicas.

[codecov-commenter]

Codecov Report

Merging #3922 (fe0febb) into master (8680ff3) will decrease coverage by 0.01%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3922      +/-   ##
==========================================
- Coverage   54.72%   54.72%   -0.01%     
==========================================
  Files         229      229              
  Lines       22065    22065              
==========================================
- Hits        12076    12074       -2     
- Misses       9343     9345       +2     
  Partials      646      646              

Flag	Coverage Δ
unittests	54.72% <ø> (-0.01%)	⬇️

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

see 1 file with indirect coverage changes

[jwcesign]

Hi, thank you for synchronizing the PR. Could you please assist in adding the release notes?

[zach593]

Fix federated-HPA plain metric calculation is incorrect when usageRatio == 1.0, keep same with resource replicas.

is it fine? @jwcesign

[chaunceyjiang]

Thanks.

/lgtm

[jwcesign]

Thanks!

`kamrada-controller-manager`: Fix federated-HPA plain metric calculation is incorrect when usageRatio == 1.0, keep same with resource replicas.

[jwcesign]

/lgtm

[jwcesign]

/cc @RainbowMango

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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• pkg/controllers/federatedhpa/OWNERS [RainbowMango]

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