🌱 Add MachinePools to handler and topology test

[willie-yao]

What this PR does / why we need it: This PR adds MachinePools to the unit tests in handler_test.go and topology_test.go. This is a follow-up task to enabling MachinePools in ClusterClass.

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 part of #10028

/area clusterclass

[chrischdi]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: c29e4cb6cb3aa64f96118da448a7479ef189f654

[sbueringer]

Thank you!!

/approve

Really appreciate your ongoing work on this!!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/retest

[sbueringer]

Not sure what that was:

∅  test/extension
∅  test/extension/handlers/lifecycle
✖  test/extension/handlers/topologymutation

=== Failed
=== FAIL: test/extension/handlers/topologymutation  (0.00s)
FAIL	sigs.k8s.io/cluster-api/test/extension/handlers/topologymutation [build failed]

Let's see if it repeats

[sbueringer]

@willie-yao Can you please look into it? I'm guessing some compile error in tests (potentially only reproducible locally after rebase onto main)

[willie-yao]

@sbueringer Should be fixed now!

[sbueringer]

Thx!

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5aadfa98d957a8a4a5b10a33ca6c0469036bca20