chore(gc): prevent redundant deletion of resources already marked for termination

[lburgazzoli]

Description

How Has This Been Tested?

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• Commit messages are meaningful - have a clear and concise summary and detailed explanation of what was changed and why.
• Pull Request contains a description of the solution, a link to the JIRA issue, and to any dependent or related Pull Request.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@lburgazzoli: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/opendatahub-operator-e2e	be15301	link	true	/test opendatahub-operator-e2e

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[ykaliuta]

lgtm