Add test "When testing the machinery for scale testing"

[sbueringer]

The goal of this issue is to implement the "When testing the machinery for scale testing" e2e test (see upstream Cluster API test) for supervisor with vcsim

(extracted from kubernetes-sigs/cluster-api#9620)

[sbueringer]

/assign @zhanggbj
(like the previous sub-task)

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/lifecycle stale

[fabriziopandini]

/remove-lifecycle stale

#3293