scheduler: reduce cycleState overhead for reservation

[saintube]

Ⅰ. Describe what this PR does

scheduler: fix the memory overhead issue for the reservation cycleState.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 59.09091% with 9 lines in your changes missing coverage. Please review.

Project coverage is 68.71%. Comparing base (61e47f0) to head (e9a15d1).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/scheduler/plugins/reservation/plugin.go	30.76%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2120      +/-   ##
==========================================
+ Coverage   68.69%   68.71%   +0.02%     
==========================================
  Files         430      430              
  Lines       40180    40188       +8     
==========================================
+ Hits        27603    27617      +14     
+ Misses      10207    10205       -2     
+ Partials     2370     2366       -4     

Flag	Coverage Δ
unittests	68.71% <59.09%> (+0.02%)	⬆️

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[ZiMengSheng]

/lgtm

[ZiMengSheng]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ZiMengSheng

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• pkg/scheduler/OWNERS [ZiMengSheng]

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