fix: hierarchical queue webhook validation use listing podgroups instead

[JesseStutler]

fix #3911

validation

Steps:

1. Create a queue parent-queue
2. Create a running job in parent-queue
3. Create a queue child-queue as the child of parent-queue
4. Check whether the create request in step-3 will be rejected by the webhook

The screenshot shows that create a child queue under parent queue which contains podgroups will be rejected:

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[JesseStutler]

/cc @Monokaix @hwdef @lowang-bh @archlitchi @googs1025