scheduler: fix missing tree id in GetQuotaSummary()

[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

[eahydra]

/lgtm
/approve

[koordinator-bot]

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (42a0c53) 67.06% compared to head (523a06d) 67.08%.

Files	Patch %	Lines
...r/plugins/elasticquota/core/group_quota_manager.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1853      +/-   ##
==========================================
+ Coverage   67.06%   67.08%   +0.02%     
==========================================
  Files         407      407              
  Lines       45704    45705       +1     
==========================================
+ Hits        30652    30662      +10     
+ Misses      12825    12819       -6     
+ Partials     2227     2224       -3     

Flag	Coverage Δ
unittests	67.08% <0.00%> (+0.02%)	⬆️

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