koord-scheduler: fix device cache potential concurrency issue

[jasonliu747]

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 coverage: 90.90% and no project coverage change.

Comparison is base (10209f4) 65.77% compared to head (df209b7) 65.78%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1182   +/-   ##
=======================================
  Coverage   65.77%   65.78%           
=======================================
  Files         290      290           
  Lines       30484    30480    -4     
=======================================
  Hits        20052    20052           
+ Misses       8969     8965    -4     
  Partials     1463     1463           

Flag	Coverage Δ
unittests	65.78% <90.90%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
pkg/scheduler/plugins/deviceshare/device_cache.go	86.88% <83.33%> (-0.04%)	⬇️
pkg/scheduler/plugins/deviceshare/plugin.go	67.22% <100.00%> (ø)
pkg/scheduler/plugins/deviceshare/pod_handler.go	87.80% <100.00%> (+4.27%)	⬆️

... and 3 files with indirect coverage changes

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[eahydra]

/lgtm
/approve

[jasonliu747]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra, jasonliu747

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• pkg/scheduler/OWNERS [eahydra]

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