🏃 Modify Metal3 provider repository

[maelk]

What this PR does / why we need it:
Metal3 Provider repository was renamed from cluster-api-provider-baremetal to
cluster-api-provider-metal3. This PR updates those references.

[k8s-ci-robot]

Hi @maelk. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[detiber]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber, maelk

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[detiber]

/ok-to-test

[k8s-ci-robot]

@maelk: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-cluster-api-capd-e2e	a4aacce	link	/test pull-cluster-api-capd-e2e

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.

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/test-infra repository. I understand the commands that are listed here.