[release-3.6] Fix unbounded io.ReadAll on peer lease HTTP handler body

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #22132

/assign ahrtr

[kubernetes-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.68%. Comparing base (5f12ec3) to head (d4cbc7e).

Files with missing lines	Patch %	Lines
server/lease/leasehttp/http.go	23.07%	8 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/lease/leasehttp/http.go	60.12% <23.07%> (-4.07%)	⬇️

... and 36 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #22148      +/-   ##
===============================================
- Coverage        68.78%   68.68%   -0.10%     
===============================================
  Files              420      417       -3     
  Lines            35890    35765     -125     
===============================================
- Hits             24686    24565     -121     
+ Misses            9752     9736      -16     
- Partials          1452     1464      +12     

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[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, k8s-infra-cherrypick-robot

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