Add e2e test for ClusterProfile

[mszadkow]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Lightweight e2e tests to prove ClusterProfile object handling in MultiKueueCluster reconcile loop.

Which issue(s) this PR fixes:

Fixes #7942

Special notes for your reviewer:

Requires to merge this PR - that prevents nil pointer panics for ClusterProfile credential providers

Does this PR introduce a user-facing change?

NONE

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[mimowo]

/assign @hdp617
PTAL

[k8s-ci-robot]

@mimowo: GitHub didn't allow me to assign the following users: hdp617.

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In response to this:

/assign @hdp617
PTAL

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[hdp617]

LGTM. Thank you!

[mimowo]

/lgtm
/approve
Thanks 👍

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 607a0c7c0ad0c2de95b894217899f323a18248bb

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mimowo, mszadkow

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• OWNERS [mimowo]

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[mimowo]

/cherrypick release-0.15

[k8s-infra-cherrypick-robot]

@mimowo: once the present PR merges, I will cherry-pick it on top of release-0.15 in a new PR and assign it to you.

In response to this:

/cherrypick release-0.15

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.

[k8s-infra-cherrypick-robot]

@mimowo: new pull request created: #8119

In response to this:

/cherrypick release-0.15

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.