koord-descheduler: release Reservation when PodMigrationJob completes or is deleted

[eahydra]

Signed-off-by: Joseph joseph.t.lee@outlook.com

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

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[codecov]

Codecov Report

Merging #438 (17cdb6d) into main (0b3ee58) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #438      +/-   ##
==========================================
+ Coverage   67.89%   67.91%   +0.01%     
==========================================
  Files         137      137              
  Lines       14989    14999      +10     
==========================================
+ Hits        10177    10186       +9     
+ Misses       4051     4050       -1     
- Partials      761      763       +2     

Flag	Coverage Δ
unittests	67.91% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...kg/descheduler/controllers/migration/controller.go	65.27% <0.00%> (-1.27%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	81.05% <0.00%> (+9.47%)	⬆️

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