🐛 Clean up namespace in e2e tests

[arshadd-b]

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Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #13019

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[arshadd-b]

Hi @sbueringer
I had checked the other tests I see mostly all the places clean up is happening either specifying manually deletion resources
or calling this cleanup function DumpSpecResourcesAndCleanup
But in scale.go deleteNamespace was missing, so added it
Please let me know anything I have missed
Thanks

[mboersma]

/lgtm

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LGTM label has been added.

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Git tree hash: bec957f8bc48c4be497007f091b1499f4c7e64bd