Replace duplicate intMax helpers with builtin max

[jahnavigajjala-3]

Fixes #16664

Proposed Changes

• Replace the duplicated intMax helpers in the KPA and HPA reconcilers with Go's built-in max() function.
• Remove the now-unused intMax helper implementations from both packages.
• Rename the local max variable in kpa/scaler.go to maxScale to avoid shadowing the built-in max() function.

[linux-foundation-easycla]

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[knative-prow]

Welcome @jahnavigajjala-3! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

Hi @jahnavigajjala-3. Thanks for your PR.

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jahnavigajjala-3
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[linkvt]

/lgtm
/ok-to-test

min could be renamed to minScale to avoid also shadowing the builtin min but this is preexisting.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.32%. Comparing base (dbce551) to head (c1256e3).

Files with missing lines	Patch %	Lines
pkg/reconciler/autoscaling/hpa/hpa.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16665      +/-   ##
==========================================
+ Coverage   80.29%   80.32%   +0.02%     
==========================================
  Files         217      217              
  Lines       13568    13560       -8     
==========================================
- Hits        10895    10892       -3     
+ Misses       2308     2303       -5     
  Partials      365      365              

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[linkvt]

/lgtm

[linkvt]

/retest