⚠ fix: Stop accumulating lists in multi-namespace cache implementation

[zxh326]

This PR fixes an issue in the multi-namespace cache implementation where repeated calls to the List() method on the same list object would accumulate results instead of resetting the list each time. This happens because the current implementation extracts existing items from the provided list object, then appends new items to it, causing the list to grow with each call.

The fix initializes a fresh empty slice for collected items instead of extracting from the existing list object.

fix #3194

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[sbueringer]

@zxh326 If you have time, can you please address this finding: #3195 (comment)

Would be great to get this into the next CR minor :)

[sbueringer]

Thank you!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 342611dc572a73a401a7c59a2bd084d262a0ecee

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer, zxh326

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