🌱 Randomly generated namespace in bootstrap pkg tests

[GrigoriyMikhalkin]

Partly solves #4629.

Updates namespace generation in bootstrap pkg tests.

[k8s-ci-robot]

Hi @GrigoriyMikhalkin. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[vincepri]

/ok-to-test

[fabriziopandini]

I guess that same comments of #4959 (review) apply here as well 😜
Looking forward to get this merged afterward comments are addressed

[fabriziopandini]

/test pull-cluster-api-test-main
Test failures seems unrelated to this PR

/lgtm
please squash commits before merging

[fabriziopandini]

/lgtm

[vincepri]

/approve

[k8s-ci-robot]

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