koord-descheduler: handle reservation filter in preparePendingJob

[lucming]

Ⅰ. Describe what this PR does

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

Patch and project coverage have no change.

Comparison is base (05c5775) 64.90% compared to head (beb16ee) 64.90%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1542   +/-   ##
=======================================
  Coverage   64.90%   64.90%           
=======================================
  Files         349      349           
  Lines       35967    35967           
=======================================
+ Hits        23343    23344    +1     
  Misses      10900    10900           
+ Partials     1724     1723    -1     

Flag	Coverage Δ
unittests	64.90% <0.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
...kg/descheduler/controllers/migration/controller.go	65.02% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[eahydra]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra

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• pkg/descheduler/OWNERS [eahydra]

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[jasonliu747]

/lgtm