🌱 cluster/topology: use cached MD list in get current state

[sbueringer]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Related #8814

[sbueringer]

/assign @fabriziopandini @killianmuldoon @ykakarap

/hold
for
/test pull-cluster-api-e2e-full-main

[sbueringer]

/hold cancel

CI green

[sbueringer]

@fabriziopandini PTAL

[killianmuldoon]

Changes make sense to me - it makes the code flow more complex though. I wonder if we can follow up (after another round of performance fixes) by documenting a list of where we actually use the APIReader, and best practices for it.

[killianmuldoon]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 8cd41c60f6f9046f6f2612b6f12d84b1a26c1d5b

[fabriziopandini]

/lgtm
/approve

+1 to take some time to document what we are learning after we finish this iteration

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[sbueringer]

Sounds good to document the findings once we have time

[killianmuldoon]

/area clusterclass