CARRY: Add delete patch to remove default namespace

[KPostOffice]

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This pull-request has been approved by: astefanutti, KPostOffice, zdtsw

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[sutaakar]

What about removing namespace creation instead of creating and then deleting it?
https://github.com/opendatahub-io/kueue/blob/dev/config/components/manager/manager.yaml#L1-L6

[astefanutti]

Generally we try not to touch the upstream configuration to avoid conflicts on rebase whenever possible.