[release-2.6] 🐛 Standardize cluster name in Fargate role names to avoid errors on mismatch between Cluster CR and EKS cluster name

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #5111

/assign richardcase

fix: Fargate: Standardize cluster name in role names to avoid errors on mismatch between Cluster CR and EKS cluster name

[damdo]

/lgtm

/assign @richardcase @nrb

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

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[richardcase]

As we cut 2.7.x in the end we can close this:

/close

[k8s-ci-robot]

@richardcase: Closed this PR.

In response to this:

As we cut 2.7.x in the end we can close this:

/close

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