Cherry-pick the GCP cross-project bug fix into release-1.11

[blackpiglet]

What steps did you take and what happened:

Cherry-pick PRs vmware-tanzu/velero-plugin-for-gcp#149 and vmware-tanzu/velero-plugin-for-gcp#150 into release-1.11 per request from.
vmware-tanzu/velero-plugin-for-gcp#150 (comment)

What did you expect to happen:

The following information will help us better understand what's going on:

If you are using velero v1.7.0+:
Please use velero debug --backup <backupname> --restore <restorename> to generate the support bundle, and attach to this issue, more options please refer to velero debug --help

If you are using earlier versions:
Please provide the output of the following commands (Pasting long output into a GitHub gist or other pastebin is fine.)

• kubectl logs deployment/velero -n velero
• velero backup describe <backupname> or kubectl get backup/<backupname> -n velero -o yaml
• velero backup logs <backupname>
• velero restore describe <restorename> or kubectl get restore/<restorename> -n velero -o yaml
• velero restore logs <restorename>

Anything else you would like to add:

Environment:

• Velero version (use velero version):
• Velero features (use velero client config get features):
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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[AgustinRamiroDiaz]

Thank you! This is super helpful for us ❤️