Replace RunSpecsWithDefaultAndCustomReporters with RunSpecs

[blackpiglet]

Describe the problem/challenge you have

After bumping Ginkgo to v2, the function RunSpecsWithDefaultAndCustomReporters used by the current E2E code is deprecated.

https://onsi.github.io/ginkgo/MIGRATING_TO_V2#removed-custom-reporters

Describe the solution you'd like

Use the function RunSpecs to replace the RunSpecsWithDefaultAndCustomReporters.

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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