scaleway: get S3 credentials from provider if not given

[Mia-Cross]

If S3_ACCESS_KEY_ID and/or S3_SECRET_ACCESS_KEY are not given by the user, kops will try to read the provider's credentials and use those instead.

For now I'm still using environment variables but as soon as #14642 gets merged, we could rework this part in order to get the credentials from the config file instead.
I tried writing the new function in a way that other providers could add their code later if they want to use this feature.

[k8s-ci-robot]

Hi @Mia-Cross. Thanks for your PR.

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[johngmyers]

/ok-to-test

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[hakman]

/remove-lifecycle rotten

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PR needs rebase.

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/lifecycle stale

[k8s-ci-robot]

@Mia-Cross: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-k8s-gce-cilium	73eb1cf	link	true	/test pull-kops-e2e-k8s-gce-cilium
pull-kops-kubernetes-e2e-ubuntu-gce-build	73eb1cf	link	true	/test pull-kops-kubernetes-e2e-ubuntu-gce-build
pull-kops-e2e-k8s-aws-calico-k8s-infra	73eb1cf	link	true	/test pull-kops-e2e-k8s-aws-calico-k8s-infra

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-triage-robot]

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

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/close

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