🌱 Publish nightly manifests to the new staging bucket

[damdo]

trafficstars

What type of PR is this? /kind support

What this PR does / why we need it:

Opening this as per discussion at: https://github.com/kubernetes-sigs/cluster-api-provider-aws/issues/4949#issuecomment-2072971287

This PR starts publishing the nightly artifacts to the k8s-staging-cluster-api-aws bucket, instead of to the artifacts.k8s-staging-cluster-api-aws.appspot.com.

The latter is the backing bucket of the google container registry and will go away eventually when we migrate from the container registry to the artifact registry. It was never meant to be used to store files that are not part of container images.

Please note that the new location has a retention of 60 days (as of now). But that should be okay for nightly manifests.

Release note:

NONE

[damdo]

/assign @nrb @richardcase

[nrb]

/lgtm

[damdo]

/assign @richardcase

[richardcase]

/approve

[k8s-ci-robot]

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