Fixing ability to specify

What does this MR do?

I was following the steps in the cleanup runbook: https://gitlab.com/gitlab-org/quality/runbooks/-/blob/main/cleanup_test_resources/index.md#manual-cleanup-of-resources-in-live-environments

step 4 sets TOP_LEVEL_GROUP_NAME to only work on a single group, but that generates an error: https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/20253887#L26

we have a missing " in the script. This MR fixes that.

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