[WIP] 🌱 taint propagation: e2e coverage via md rollout test

[chrischdi]

What this PR does / why we need it:

Implements e2e tests for taint propagation feature: #12908

TODO:

• merge ✨ taint propagation: machine related API changes, conversion and feature gate #12936
• rebase

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

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[chrischdi]

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[chrischdi]

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

[chrischdi]

Unrelated flake?

/retest