🌱 Randomly generated namespace in controlplane pkg tests

[GrigoriyMikhalkin]

Partly solves #4629.

Updates namespace generation in controlplane pkg tests.

[k8s-ci-robot]

Hi @GrigoriyMikhalkin. Thanks for your PR.

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[fabriziopandini]

/ok-to-test
please ensure namespace cleanup and whenever possible replace "default" with a random namespace

[fabriziopandini]

/lgtm

[fabriziopandini]

please squash commits before merging

[fabriziopandini]

/lgtm

[vincepri]

/approve

[k8s-ci-robot]

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