🐛 Fix default namespace of RemediationTemplate for ClusterClass and Topology

[chess-knight]

What this PR does / why we need it:
Adds namespace defaulting for the ClusterClass & Cluster.spec.topology.

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 #10805

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[sbueringer]

/ok-to-test

[sbueringer]

Thx!

/lgtm
/approve

/test pull-cluster-api-e2e-main

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 14774c0eef1f78e1985c0a79729192e93b6f34ef

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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