🌱 test: check for metadata.yaml when resolving releases to not try to use unreleased versions

[chrischdi]

What this PR does / why we need it:

Similar to what clusterctl does since this PR got implemented: #10220

We now do it similar to that in e2e tests where it failed before.

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 #10450

/area e2e-testing

[chrischdi]

/test help

[k8s-ci-robot]

@chrischdi: The specified target(s) for /test were not found.
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• /test pull-cluster-api-e2e-main
• /test pull-cluster-api-e2e-mink8s-main
• /test pull-cluster-api-e2e-upgrade-1-30-1-31-main
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/test help

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[chrischdi]

/test pull-cluster-api-e2e-main

[chrischdi]

/cherry-pick release-1.7

[k8s-infra-cherrypick-robot]

@chrischdi: once the present PR merges, I will cherry-pick it on top of release-1.7 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.7

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[chrischdi]

cc @adilGhaffarDev

[sbueringer]

/approve

/assign @fabriziopandini

[fabriziopandini]

nice!
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4ebf4fef0e50139d5e8ad19906e83279e1176bb6

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini, sbueringer

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• OWNERS [fabriziopandini,sbueringer]

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[k8s-infra-cherrypick-robot]

@chrischdi: new pull request created: #10645

In response to this:

/cherry-pick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.