🌱 Add dry-run CreateOrUpdate call in clusterctl upgrade e2e tests

[cahillsf]

What this PR does / why we need it:
Ensures that applying the cluster template in clusterctl upgrade e2e tests succeeds in dry-run before actually creating/updating

as discussed here: #11133 (comment)

/area e2e-testing

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[cahillsf]

/test pull-cluster-api-e2e-main

[sbueringer]

Thank you very much!!

/test pull-cluster-api-e2e-main

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 38831309b863a879d4c6239640a5ffd34e78c9d5

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[cahillsf]

/cherry-pick release-1.8

[k8s-infra-cherrypick-robot]

@cahillsf: new pull request created: #11458

In response to this:

/cherry-pick release-1.8

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