fix(qrm): fix cpu admit failed caused by float ceil

[nightmeng]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

Fix cpu admit failed caused by float ceil

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 85.93750% with 9 lines in your changes missing coverage. Please review.

Project coverage is 57.23%. Comparing base (56ba904) to head (1f93cf4).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...-plugins/cpu/dynamicpolicy/policy_hint_handlers.go	90.00%	2 Missing and 1 partial ⚠️
...ugins/memory/dynamicpolicy/policy_hint_handlers.go	76.92%	2 Missing and 1 partial ⚠️
...md/katalyst-agent/app/options/qrm/memory_plugin.go	50.00%	2 Missing ⚠️
pkg/agent/qrm-plugins/util/util.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #704      +/-   ##
==========================================
+ Coverage   57.17%   57.23%   +0.05%     
==========================================
  Files         570      570              
  Lines       54864    54871       +7     
==========================================
+ Hits        31370    31403      +33     
+ Misses      19540    19519      -21     
+ Partials     3954     3949       -5     

Flag	Coverage Δ
unittest	57.23% <85.93%> (+0.05%)	⬆️

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