vpa - fix checkpoint gc of unknown recommenders

[BojanZelic]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes the unintentional deletion of VPA checkpoints if using multiple recommenders

Which issue(s) this PR fixes:

Fixes #6387

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla]

• ✅login: BojanZelic / (bc83411)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

Hi @BojanZelic. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BojanZelic, XiangningLi
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[adrianmoisey]

(I'm not an owner of this code and my review is meaningless)
This code seems fine to me. It seems worth getting tests running and getting eyes from someone with actual review powers to look at it