[release-1.8] 🌱 test: improve autoscale tests for to/from zero and running autoscaler in bootstrap cluster

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #11082

/assign sbueringer

[chrischdi]

/test help

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[chrischdi]

/test pull-cluster-api-e2e-release-1-8

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ee302731f9067c127cbd35e4dab65c814af24969

[sbueringer]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrischdi, sbueringer

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