🌱 e2e: fix md-rollout test to test in-place taint changes before doing the rollout change

[chrischdi]

What this PR does / why we need it:

Analyze and fix taint propagation flake:

xref: #13008

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 #

/area e2e-testing

[chrischdi]

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[chrischdi]

/test pull-cluster-api-e2e-blocking-main

[chrischdi]

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[chrischdi]

/test pull-cluster-api-e2e-main-gke

[sbueringer]

Thx for the quick fix!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: fadf8a995388603f01a0547e11fddd50571a3f9d

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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