🐛 test: Fix finalizers test to not only rely on namespaced name

[chrischdi]

What this PR does / why we need it:

#9833 introduced that objects like e.g. machine and dockermachine use the same name.

The finalizers test relied on the name for indexing objects which is not possible anymore after the above change.

This fix adds the kind to the index used in the test to not mix up types.

Fixes this flakes

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 testing

[chrischdi]

/retitle 🐛 test: Fix finalizers test to not only rely on namespaced name

[chrischdi]

/test help

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[chrischdi]

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

[chrischdi]

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

[sbueringer]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 9ae370b8089bf93f405930cdfc362838f949f670

[sbueringer]

Failed because of the other flake otherwise green

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/override pull-cluster-api-e2e-full-main

[k8s-ci-robot]

@sbueringer: Overrode contexts on behalf of sbueringer: pull-cluster-api-e2e-full-main

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/override pull-cluster-api-e2e-full-main

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[sbueringer]

/cherry-pick release-1.6

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #10004

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/cherry-pick release-1.6

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