Bump Ginkgo to v2

[blackpiglet]

Describe the problem/challenge you have

Bump Ginkgo to v2, and resolve potential conflicts.
https://onsi.github.io/ginkgo/MIGRATING_TO_V2#major-changes

Describe the solution you'd like

Anything else you would like to add:

Environment:

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

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[kaovilai]

I think #7957 should be part of this issue just because without it, you cannot remove v1 references.

[blackpiglet]

Agree.