[cherry-pick]Empty the list before next round of listing

[ywk253100]

Empty the list before next round of listing

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Fixes #(issue)

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• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 62.04%. Comparing base (2c57ed8) to head (27a4bfc).

Files	Patch %	Lines
pkg/util/kube/periodical_enqueue_source.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.13    #7644      +/-   ##
================================================
+ Coverage         61.67%   62.04%   +0.37%     
================================================
  Files               262      262              
  Lines             28444    22422    -6022     
================================================
- Hits              17543    13912    -3631     
+ Misses             9664     7272    -2392     
- Partials           1237     1238       +1     

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