koordlet: add close for querier

[zwzhang0107]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

#1981

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: Patch coverage is 48.00000% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 68.67%. Comparing base (2dc8735) to head (8a798c4).
Report is 9 commits behind head on main.

Files	Patch %	Lines
pkg/koordlet/metriccache/tsdb_storage.go	25.00%	6 Missing ⚠️
pkg/koordlet/qosmanager/helpers/metrics_query.go	0.00%	3 Missing and 2 partials ⚠️
pkg/koordlet/prediction/prediction.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1995      +/-   ##
==========================================
+ Coverage   67.50%   68.67%   +1.17%     
==========================================
  Files         421      421              
  Lines       47100    38839    -8261     
==========================================
- Hits        31795    26673    -5122     
+ Misses      12990     9860    -3130     
+ Partials     2315     2306       -9     

Flag	Coverage Δ
unittests	68.67% <48.00%> (+1.17%)	⬆️

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[saintube]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes, jasonliu747, saintube

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• OWNERS [hormes]

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