✨ feat: add support for 'eus' channelGroupType in ROSA provider

[andreadecorte]

What type of PR is this?
This PR adds support for the 'eus' channelGroupType in ROSA provider, and updates documentation appropriately
/kind feature

What this PR does / why we need it:
Extend list of supported channel groups

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 #

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• includes emoji in title
• adds unit tests
• adds or updates e2e tests

Release note:

Add support for 'eus' channelGroupType in ROSA provider

[k8s-ci-robot]

Welcome @andreadecorte!

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[k8s-ci-robot]

Hi @andreadecorte. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[richardcase]

/ok-to-test

[serngawy]

thanks for the PR @andreadecorte

[damdo]

/lgtm

/assign @richardcase @nrb

For approval, thanks!

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4da544fbbf4d913d601523e1f165e133b8cd22b3

[nrb]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nrb

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Needs approval from an approver in each of these files:

• config/crd/bases/OWNERS [nrb]
• controlplane/rosa/OWNERS [nrb]
• docs/book/src/topics/rosa/OWNERS [nrb]

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[damdo]

/cherry-pick release-2.9

[k8s-infra-cherrypick-robot]

@damdo: new pull request created: #5665

In response to this:

/cherry-pick release-2.9

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