koord-descheduler: update PodRef after Reservation Bound during migration

[ZiMengSheng]

Ⅰ. Describe what this PR does

this PR handle Reservation Bound Success and report boundPod to PodMigrationJob.Status.PodRef before check pod ready.

Ⅱ. Does this pull request fix one issue?

fixes #1093

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 coverage: 77.77% and project coverage change: -0.03 ⚠️

Comparison is base (f8b4e31) 67.09% compared to head (50f0a39) 67.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1096      +/-   ##
==========================================
- Coverage   67.09%   67.07%   -0.03%     
==========================================
  Files         262      262              
  Lines       28960    28978      +18     
==========================================
+ Hits        19430    19436       +6     
- Misses       8173     8181       +8     
- Partials     1357     1361       +4     

Flag	Coverage Δ
unittests	67.07% <77.77%> (-0.03%)	⬇️

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	61.24% <77.77%> (+0.36%)	⬆️
...sor/collectors/beresource/be_resource_collector.go	67.82% <0.00%> (-6.09%)	⬇️
pkg/scheduler/plugins/coscheduling/core/gang.go	76.97% <0.00%> (-0.95%)	⬇️
pkg/util/httputil/reverseproxy.go	84.84% <0.00%> (-0.27%)	⬇️
pkg/koordlet/util/system/common_linux.go	66.94% <0.00%> (+2.47%)	⬆️

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[jasonliu747]

/lgtm

[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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