Decoupled deletion in queue cache from full workload objects.

[Singularity23x0]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Simplifying the queue cache integration with the workload controller.
The PR cleans up the use of full workloads where just their keys suffice.

Which issue(s) this PR fixes:

Part 1.4 of addressing: #5310

Special notes for your reviewer:

Followup to #7915

Does this PR introduce a user-facing change?

NONE

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Singularity23x0
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[k8s-ci-robot]

Hi @Singularity23x0. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mbobrovskyi]

/ok-to-test

[k8s-ci-robot]

PR needs rebase.

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