⚠️ ClusterToObjectsMapper: replace runtime.Object parameter with client.ObjectList

[sbueringer]

Signed-off-by: Stefan Büringer buringerst@vmware.com

What this PR does / why we need it:
Extracted from: #5383 (comment)

Let's make this breaking change now (before v1.0.0), so we can avoid it after the release.

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 #

[sbueringer]

/assign @vincepri

[k8s-ci-robot]

@sbueringer: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-apidiff-main	62cebab	link	false	/test pull-cluster-api-apidiff-main

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[vincepri]

/approve
/lgtm

[k8s-ci-robot]

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