scheduler: fix the method of calculating desiredCount in DeviceShare ApplyForAll strategy

[eahydra]

Ⅰ. Describe what this PR does

1. Add unit testing for DefaultDeviceHandler of DeviceShare plugin.
2. Fix the method of calculating desiredCount in DeviceShare ApplyForAll strategy. The ApplyForAll strategy will select devices that match the selector of hint, if no devices can match, will return the error to stop scheduling.

Ⅱ. Does this pull request fix one issue?

fix #1869

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

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (07e51fa) 67.23% compared to head (1ad34d9) 67.28%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...duler/plugins/deviceshare/devicehandler_default.go	92.59%	1 Missing and 1 partial ⚠️
...scheduler/plugins/deviceshare/devicehandler_gpu.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1870      +/-   ##
==========================================
+ Coverage   67.23%   67.28%   +0.04%     
==========================================
  Files         410      410              
  Lines       45662    45676      +14     
==========================================
+ Hits        30702    30731      +29     
+ Misses      12742    12730      -12     
+ Partials     2218     2215       -3     

Flag	Coverage Δ
unittests	67.28% <90.62%> (+0.04%)	⬆️

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[ZiMengSheng]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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