Bump the Ginkgo version to v2

[blackpiglet]

• Replace RunSpecsWithDefaultAndCustomReporters - Replace RunSpecsWithDefaultAndCustomReporters with RunSpecs #7957
• Adjust default timeout - Need to set the E2E test timeout after bumping Ginkgo to v2 #7958
• Use labels instead of regex - Use labels instead of text message to filter test cases #7959
• Support running test parallelly - Support running test cases parallelly #7960
• Bump Ginkgo to v2 - Bump Ginkgo to v2 #7961

Describe the problem/challenge you have

Ginkgo v2 supports more features, and the Ginkgo v1 is not maintained anymore.
https://github.com/onsi/ginkgo/blob/ver2/docs/MIGRATING_TO_V2.md#upgrading-to-ginkgo-20
https://github.com/onsi/ginkgo/blob/ver2/docs/MIGRATING_TO_V2.md#aborting-the-test-suite

Propose to upgrade the Velero E2E using Ginkgo to v2 to utilize the new functionality.

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]

We've done this in OADP in the past. If you can break the tasks out I can assist here.

[blackpiglet]

@kaovilai
Great.
Were there any issues or PRs on the OADP side that I can take as a reference?

[kaovilai]

This is the main one we did to move to v2 openshift/oadp-operator#560

I think we had a mix of both in go.mod initially but eventually removed v1 references.

[kaovilai]

Last v1 removal was simply

-	"github.com/onsi/ginkgo"
+	"github.com/onsi/ginkgo/v2"

[blackpiglet]

@kaovilai
Thanks.
After reading some Ginkgo documents, I broke this Epic task into sub-tasks.
I'm still getting familiar with the Ginkgo framework. There could be something inaccurate, or something important is still missing.
Appreciate any help.