scheduler: remove deepCopy of reservationInfo

[ZiMengSheng]

Ⅰ. Describe what this PR does

就是为了去掉这个，但是不想加锁，所以这样操作下

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

[koordinator-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 77.39130% with 26 lines in your changes missing coverage. Please review.

Project coverage is 67.87%. Comparing base (d376bf5) to head (473a63c).
Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/scheduler/plugins/reservation/cache.go	80.35%	9 Missing and 2 partials ⚠️
pkg/scheduler/plugins/reservation/snapshot.go	76.74%	9 Missing and 1 partial ⚠️
pkg/scheduler/frameworkext/reservation_info.go	54.54%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2169      +/-   ##
==========================================
- Coverage   67.87%   67.87%   -0.01%     
==========================================
  Files         443      444       +1     
  Lines       41921    42024     +103     
==========================================
+ Hits        28454    28523      +69     
- Misses      11013    11040      +27     
- Partials     2454     2461       +7     

Flag	Coverage Δ
unittests	67.87% <77.39%> (-0.01%)	⬇️

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[saintube]

missing a license header

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